How long you have to dispute a phone bill credit problem: AT&T, Verizon, and T-Mobile

T-Mobile: 60 days, in writing

Sixty days is shorter than T-Mobile's own two-cycle credit start window plus one support call, so a written note sent as soon as the window closes is the safe habit. The terms also require you to keep paying disputed charges until the dispute is resolved.

AT&T: 120 days from the bill date

AT&T's clause is met by notifying customer service, so a documented call or chat inside 120 days counts; keep the case number as proof. The Notice of Dispute is the next step, submitted through AT&T's dispute page or by mail, and AT&T says an escalations representative will contact you.

Verizon: in writing, no day count in the current agreement

Earlier versions of Verizon's agreement stated a 180-day limit for disputing a bill, and some third-party summaries still repeat it. We could not find a day count for billing disputes in the June 16, 2026 agreement; the only 180-day reference in it concerns credits for service interruptions. Treat the absence as "write promptly," not as unlimited time, and check the current agreement before relying on either reading.

What the deadline does and does not do

• It is the carrier's contractual condition for keeping the right to bring the dispute to arbitration or small claims. Missing it does not stop you from calling support or asking for a review; it can limit what you can do if support says no.
• It runs per bill or per charge under the wording of all three clauses, so each short bill has its own count. A late start on one bill does not waive the newer ones.
• It is separate from the pre-arbitration Notice of Dispute period (60 days at all three carriers) and from any deadline in the FCC process, which has its own rules.
• State law can override it; AT&T's clause says so directly, and T-Mobile's and Verizon's include "unless otherwise provided by law."

Which channel is which

• Carrier support call or chat. The fastest way to get the promotion reviewed and a case number. At AT&T it also satisfies the 120-day clause.
• Written dispute. A letter to the address on the bill or the carrier's dispute address, or the carrier's online dispute form. This is what T-Mobile and Verizon require to preserve arbitration and small-claims rights.
• Notice of Dispute. The formal pre-arbitration notice each carrier's agreement describes. It starts a 60-day negotiation period; each carrier provides a form or address.
• FCC informal complaint. Free and online. The FCC forwards it to the carrier, which must respond in writing within 30 days. The FCC does not decide the dispute. See the FCC guide.
• Better Business Bureau. A private organization, not a regulator; a carrier's response there is voluntary.
• Small claims or arbitration. The formal routes the agreements describe after a Notice of Dispute. Consider legal advice before either.

What to preserve

• PDFs of every bill from the purchase onward, especially the first short bill and its date.
• The offer, order confirmation, installment or device payment agreement, and trade-in records.
• Any carrier notice about eligibility, removal, or a plan change, with its date.
• Case or reference numbers, dates, and names from every contact.
• A copy of the written dispute or Notice of Dispute and proof of when it was sent.

How this applies to promotional credits

A missing promotional credit makes the bill higher than it should be, so disputing the credit is disputing the bill, and the clauses above apply. While a credit is still inside the carrier's start window there is nothing to dispute yet. Once the window closes, or a credit stops or is removed, note the date of the first affected bill and put the dispute in writing within the carrier's period even if a support review is still open. One more caution from T-Mobile's clause, which is worth assuming elsewhere: accepting a credit or other benefit to settle the dispute can close it, so read any settlement offer against the full remaining promotion.

Where Phone Deal Audit fits

Phone Deal Audit is informational software. It compares the promised credits with the credits on your bills, shows the amount in question and the remaining promotional value, and, if a discrepancy is found, organizes a chronology and a written request from your own records. It does not send disputes, file complaints, or give legal advice. Carrier pages: Verizon, AT&T, T-Mobile.

Questions people ask