If a mobile bill has a charge you don't recognize, start with the exact line item rather than the total due. Save the bill, find the order or plan record connected to the charge, and keep a record of every contact with the carrier.

Two disputes may be involved:

• The carrier dispute concerns the wireless account and follows the carrier's agreement and complaint process.
• A charge that appears on a credit-card statement may also qualify for the Fair Credit Billing Act's written billing-error process.

The often-cited 60-day, 30-day, and 90-day periods apply to qualifying credit-card billing errors. They don't automatically set a deadline for every complaint about a wireless invoice. Separately, when the FCC serves an informal complaint on a provider, the provider must respond to the FCC in writing within 30 days.

This information is for U.S. consumers and isn't legal advice.

Start with the disputed line

A quick, organized first pass can prevent the dispute from turning into a disagreement about the entire account.

1. Save the complete bill. Download the PDF or make a copy, including the page with the disputed charge, account number, and billing period. Save a prior bill for comparison.
2. Mark each item you challenge. Note the amount, date, line or device, and why you believe the charge is wrong.
3. Check the records behind it. Look for plan terms, promotion details, order confirmations, device-payment records, trade-in or return receipts, and cancellation records.
4. Contact the carrier through a current official channel. Use the app, website, or contact information printed on the bill. Old addresses and phone numbers can delay a written dispute.
5. Ask for a case number and a written result. Find out whether the carrier will remove the charge, correct the device balance, apply a credit, or issue a refund.
6. Send the dispute in writing. A call may start the review, but a dated letter or secure message gives you a record of what you reported and when.
7. Protect any separate payment-dispute deadline. If you used a credit card, send the card issuer its own written billing-error notice within the applicable period.
8. Escalate if necessary. An informal FCC complaint can prompt a written response from the provider, but it isn't a guaranteed refund.

Don't treat a promised adjustment as complete until the credit appears on the account or you receive written confirmation of the refund.

What might be wrong with a mobile bill?

An unfamiliar charge isn't necessarily fraud. Review the bill by category:

• Plan charges: The monthly rate, number of lines, included data, or service tier may differ from the agreement.
• Device payments: An installment may still appear after a payoff, return, trade-in, or warranty replacement was processed incorrectly.
• Promotional credits: A discount may be missing, late, or attached to the wrong line. Check the promotion's eligibility rules and credit period.
• One-time charges: Activation, upgrade, reconnection, late, or equipment fees may be duplicated or inconsistent with the order confirmation.
• Usage charges: Roaming, international calls, premium services, and excess-data charges call for a review of the usage records.
• Taxes and government fees: These can change with location and service type. Ask the carrier to identify an unfamiliar tax or fee before labeling it an error.
• Third-party charges: A service you never approved may have been placed on the phone bill.

Unauthorized third-party charges and cramming

Cramming means placing an unauthorized third-party charge on a phone bill. The FTC's mobile cramming guidance describes phone billing as a vehicle for charges consumers didn't approve. A New York Department of Public Service consumer guide gives examples of vague descriptions, including activation, membership, enhanced services, access, and minimum-usage fees.

If you suspect cramming:

1. Ask the carrier which company submitted the charge and what authorization it says it has.
2. Request removal of the charge and a refund for earlier amounts you didn't authorize.
3. Ask whether third-party or premium billing can be blocked on the account.
4. Save the itemized bill, messages, emails, and website records connected with the service.
5. Report suspected fraud through the carrier and the appropriate government reporting channel, including the FTC's cramming resources.

The carrier may investigate the third party before deciding whether to issue a refund. An FCC or FTC complaint can create a record and prompt a response, but neither process automatically establishes that you are owed money.

Save evidence before contacting the carrier

Whether the account is with AT&T, Verizon, T-Mobile, or another provider, these records can help:

• The disputed bill and at least one earlier bill
• The service agreement, plan summary, or promotion terms
• Order confirmations and trade-in or return receipts
• Device-installment and payoff records
• Payment confirmations and bank or card statements
• Screenshots of account changes, chats, and online offers
• Dates, representative names or IDs, case numbers, and call summaries
• Usage records for roaming, international, premium, or excess-data charges
• Cancellation confirmations and equipment-return tracking
• Evidence of unauthorized account access, if relevant

Send copies, not irreplaceable originals. Before uploading anything, remove passwords, full payment-card numbers, and unnecessary personal information. Leave enough account and bill information for the carrier or card issuer to match the dispute.

You usually don't need an IMEI for an ordinary billing error. It may help with a device-specific problem, but the bill, order record, and account history are usually more useful.

Dispute the charge with the mobile carrier

Ask what created the charge

Identify the line item and ask the carrier:

• What service or transaction created it?
• When was it added?
• Which line or device does it apply to?
• What plan term, order, or authorization supports it?
• Why wasn't a promised credit applied?
• When will a correction appear?

A representative may give you an explanation without actually changing the account. Before ending the call or chat, ask what action will be taken and when.

Request a specific remedy

Say what you want the carrier to do. Depending on the problem, that could be:

• Remove an unauthorized charge
• Refund the original payment method
• Apply an account credit
• Correct a device balance
• Add missing promotional credits
• Reverse a fee caused by the carrier's error
• Explain in writing why the charge was denied

If the carrier offers only a partial credit, ask whether it resolves the whole dispute or just one billing period.

Keep the conversation record

Write down the date, time, representative's name or ID, case number, promised action, and expected completion date. Save chat transcripts and confirmation emails. If the representative says the account will be corrected, ask for that statement in writing.

Send a written dispute

Use the carrier's stated billing-dispute address, secure-message system, or another official written channel. For a mailed letter, use a trackable service and keep the receipt.

A letter can be brief:

[Your name]
[Address]
[Account number]
[Phone number]
[Date]

Re: Dispute of charges on the [billing period] statement

I dispute the following charge or charges on my account:

- [Amount, description, line, and date]
- [Amount, description, line, and date]

The charge is disputed because [explain the billing error, lack of authorization,
missing promotion, returned equipment, cancellation issue, or other reason].

Please investigate, remove or correct the disputed amount, and confirm in writing
whether you will issue a refund or account credit. Please also provide the case
number and identify any contract term or authorization supporting a charge you
believe is valid.

Attached are copies of [list your evidence]. Please do not treat this letter as a
dispute of amounts that are not listed above.

Sincerely,

[Your name]

There isn't a universal FCC rule requiring a carrier to refund every mobile-bill dispute within 30 days. The carrier's account agreement and process control the direct complaint. The FCC's 30-day requirement applies after the provider receives an informal FCC complaint.

If the charge appears on a credit-card statement

The carrier complaint and the card dispute are separate. Fixing one record doesn't necessarily fix the other.

If a carrier charge appears on your credit-card statement and the facts fit a billing error, such as an unauthorized charge or incorrect amount, send the issuer a written billing-error notice. The FTC's credit-card guidance says the notice must reach the issuer within 60 days after the first statement with the error was sent.

Send it to the billing-dispute address on the statement, not only to the address used for payments. Include:

• Your name and account number
• The amount and date of the charge
• The carrier or merchant name as it appears on the statement
• Why the charge is wrong
• Copies of the bill, carrier correspondence, and other supporting records

The issuer generally must:

• Acknowledge the written dispute within 30 days, unless it has already resolved the problem
• Resolve the dispute within two billing cycles, and no more than 90 days after receiving it
• Follow the applicable billing-error procedures while reviewing the claim

Under the FTC's guidance, you generally don't have to pay the disputed amount or related finance or other charges during the investigation, but you should pay the rest of the statement on time. Follow the issuer's instructions and keep proof that the notice arrived.

The 60-day period runs from the credit-card statement, not automatically from the carrier's invoice. If you missed it, contact the issuer promptly and ask what options remain; don't assume the FCBA deadline still applies.

A temporary credit or reversal by the card issuer may not change the carrier's account ledger. Tell the carrier that the payment is under dispute and ask how it will prevent the account from becoming delinquent if the issuer reverses the transaction. If the carrier later issues a refund or credit, tell the card issuer so you don't receive a duplicate recovery.

Debit cards, prepaid cards, and bank-account payments

The credit-card rules above don't automatically cover debit cards, prepaid cards, ACH payments, or other electronic transfers. Contact the bank or payment provider promptly and ask which unauthorized-transaction or payment-dispute procedure applies.

Continue pursuing the carrier correction. Reversing a payment doesn't necessarily remove the balance from the wireless account.

File an informal FCC complaint

If the carrier doesn't resolve the matter, use the FCC's Consumer Inquiries and Complaints Center. The center accepts informal complaints about wireless billing and related service issues.

Have these details ready:

• Carrier account number and service address
• Billing period and exact disputed amount
• Short description of what happened
• Dates and case numbers from your carrier contacts
• Relevant bills, agreements, and correspondence
• The result you want, such as removal of a charge or correction of a device balance

The FCC serves the informal complaint on the provider. The provider must respond to the complaint in writing within 30 days of receipt and provide the FCC with a copy of that response. Keep the complaint confirmation and the provider's reply.

That deadline concerns the response, not a refund. The FCC process may cause the carrier to review the account, but it doesn't automatically decide how much you are owed. State the facts in date order and ask for one precise remedy.

A formal FCC complaint is different. The FCC's complaint FAQ directs consumers to sections 1.720 through 1.740 of the FCC rules, located at 47 C.F.R. Formal complaints are more technical and may not be the right first step for a routine billing error.

Other escalation options

Choose the next step based on what went wrong:

Arbitration and small claims

Wireless agreements can differ on arbitration deadlines, filing fees, notice requirements, and whether a small-claims option exists. Those terms can also change, so use the version that applies to your account.

Check whether the agreement says:

• Arbitration is mandatory
• You must send a written notice before filing
• The carrier gets time to resolve the matter first
• Notice must go to a particular address or be sent in a particular way
• A specific forum or fee schedule applies
• Small claims is available
• A deadline applies to the claim

Keep the agreement and your evidence. If the dispute involves service termination, collections, identity theft, or a large amount, a qualified consumer lawyer or legal-aid organization may be able to explain the options.

Deadlines that matter

Start when you notice the problem. Delay can make order and usage records harder to locate, and it may cause you to miss the credit-card billing-error period or a contract-specific notice requirement.

What to do if the bill is due

A dispute doesn't automatically place the entire wireless account on hold. If possible, pay the amount you don't dispute and contact the carrier before the due date about the contested balance.

Ask for a written hold on collection or service action while the review is pending, but don't assume the carrier must grant one. If the carrier threatens suspension, collections, or a late fee, save the notice and identify exactly which amount is disputed.

When a card issuer is reviewing the payment, coordinate with both companies. A reversed card payment can leave the carrier account showing a balance, even while the card dispute is open.

Reduce the chance of another billing error

• Check the first bill after a plan change, upgrade, trade-in, return, or cancellation.
• Keep promotion terms and order confirmations until all promised credits appear.
• Review every line for unwanted features, insurance, international services, and device installments.
• Recheck autopay after an account change.
• Use a strong, unique carrier password and multi-factor authentication where available.
• Review authorized users and account-access alerts.
• Ask whether premium or third-party billing can be blocked.
• Keep cancellation confirmations and equipment-return tracking.
• Set roaming and travel controls before leaving the country.
• Compare the new bill with the prior bill instead of checking only the amount due.

Mobile bill complaint FAQ

How long do I have to dispute a mobile bill?

There is no single deadline for every carrier invoice. Check the service agreement and contact the carrier promptly. If the charge appears on a credit-card statement and qualifies as a billing error, the issuer generally must receive the written notice within 60 days after the first statement with the error was sent.

Does the FCC require a refund within 30 days?

No. The 30-day requirement concerns the provider's written response to an informal FCC complaint. It isn't a general refund deadline. The billing facts, account agreement, and applicable payment rules determine whether a credit or refund is due.

Should I contact the carrier or the card issuer first?

Contact the carrier quickly because it controls the wireless account. If the charge is on a credit-card statement, send the issuer a separate written dispute within the 60-day period. Tell each company about the other dispute so any credit or refund is recorded correctly.

What should I do about a charge I never authorized?

Ask the carrier for the third party's name, its claimed authorization, removal of the charge, and a refund. Request a block on future third-party billing if available. Save the bill and report suspected mobile cramming through the carrier and the FTC's mobile cramming resources.

Do AT&T, Verizon, and T-Mobile use the same process?

No. Their contact channels, account terms, escalation systems, and arbitration provisions may differ. The practical starting point is the same: identify the line item, gather the records, use a current official contact channel, and obtain a written case record.

Can I stop paying the entire bill while it's disputed?

Don't stop paying the whole account without checking the carrier's terms and the payment method involved. Pay undisputed amounts when possible, ask for a hold on the disputed balance, and use the separate credit-card process if it applies.

Official guidance

• FCC Consumer Inquiries and Complaints Center
• FCC Filing a Complaint Questions and Answers
• FTC Using Credit Cards and Disputing Charges
• FTC Mobile Cramming
• New York Department of Public Service Consumer Guide to Cramming

Before you contact anyone, circle the disputed line, save the complete bill and the supporting order or promotion record, and write down the result you want. If a credit-card statement is involved, check its statement date before sending the issuer's written notice.