To unlock a phone, contact the carrier that locked or sold it, meet that carrier’s device-specific eligibility rules, and submit its official request—or wait for automatic unlocking if the carrier provides it. Then check that the phone supports the new carrier’s network and services. An unlock removes a carrier restriction; it does not make incompatible hardware compatible.
Before you start: identify who locked the phone
The carrier that sold or locked the device determines its unlock process, even if you now use a different SIM provider. Find the phone’s exact model and check its status with the original carrier. T-Mobile specifically directs people with devices it did not sell or authorize to contact the original carrier or manufacturer.
Carrier policies change, and eligibility can depend on whether the phone is postpaid or prepaid, its payment status, account standing, and how long it has had active service. The policies below are for AT&T, T-Mobile, and Verizon in the United States; they do not establish rules for every MVNO or other provider. Check the linked policy before requesting an unlock.
How to unlock an AT&T phone
Use AT&T’s official unlock support page to review eligibility and submit a request. The page, last updated June 29, 2026, lists these requirements and qualifications:
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- The device must be paid in full and not reported lost or stolen or involved in fraud.
- The current AT&T account must be current. Contract terms, business-device conditions, and an early-upgrade waiting period may also affect eligibility.
- AT&T Prepaid phones require 12 months of paid AT&T service. The device cannot be active on another AT&T account and must not be reported lost, stolen, or involved in fraud.
- A general 60-day purchase condition also applies; check AT&T’s page for the conditions relevant to your device and account.
Some eligible Apple, Google, and Samsung phones may unlock automatically; other devices require a request. AT&T says requests usually take minutes to approve but may take up to 48 hours. Confirm the result in AT&T’s unlock portal. On an iPhone, check Settings > General > About > Carrier Lock.
How to unlock a T-Mobile phone
Read T-Mobile’s SIM unlock policy and check the device’s eligibility. T-Mobile says it automatically and remotely unlocks eligible supported devices within two business days. If remote unlocking is not supported, it sends a notification with instructions. Its policy may change without notice.
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Postpaid devices
Generally, the phone must have been active on the requesting T-Mobile line for at least 40 days. Any T-Mobile financing or lease must be paid in full; if the account was canceled, it must have a zero balance. The device must have been sold by T-Mobile, must not be reported lost, stolen, or blocked, and the account must be in good standing.
Prepaid devices
Generally, a prepaid phone must have been active for 365 days. T-Mobile’s policy also describes an earlier-unlock path: the associated prepaid account must have received more than $100 in refills for each active line, and more than 14 days must have passed since purchase. Other limits and eligibility checks can apply, so confirm the details in the policy.
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How to unlock a Verizon phone
Verizon’s device unlocking policy, updated February 18, 2026, distinguishes between postpaid and prepaid phones purchased directly from Verizon.
Postpaid devices
A device unlocks automatically when bought at full retail price or after its financing is paid in full. A secure payment is required for immediate unlocking after payoff; paying with a Verizon gift card results in a 35-day delay. A lost or stolen report can block unlocking until the issue is cleared.
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Prepaid devices
A Verizon prepaid phone generally requires 365 days of paid, active service. The policy also addresses devices deemed stolen or fraudulently purchased. Business-device and deployed-military provisions differ, so consult the applicable subsection and agreement rather than assuming the standard consumer rules apply.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to check whether a phone is unlocked
Start with the original carrier’s device or account status tool; the carrier can confirm whether its restriction has been removed. For an iPhone, go to Settings > General > About and look for Carrier Lock. AT&T identifies “No SIM restrictions” as the unlocked status. Menu labels and status checks can vary on other phones, so use the manufacturer’s instructions or ask the carrier if the status is unclear.
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A status reading of unlocked does not guarantee the phone will work fully on another network. Verify compatibility with the destination carrier before moving service.
Check compatibility before switching carriers
Use the destination carrier’s device-compatibility checker with the phone’s exact model number. Confirm that the model supports the required network technology and the voice, data, and messaging features you need. A phone can be unlocked but lack the bands or features needed for reliable or complete service on a particular carrier.
If the phone is branded by an MVNO, check that company’s unlock policy or ask the original seller. AT&T, T-Mobile, and Verizon policies should not be assumed to cover every MVNO.
Unlocking checklist
- Identify the original seller or carrier. Do not assume the provider whose SIM is currently in the phone sold it.
- Find the exact phone model and unlock status. Check the original carrier’s device or account tool.
- Meet the applicable eligibility conditions. These may include payoff, contract terms, account standing, paid active service, or a waiting period.
- Use the official process. Submit the carrier’s request or follow its automatic-unlock instructions. Avoid services that promise to bypass carrier eligibility without substantiated support.
- Check the destination network separately. Verify model compatibility and the services you need before porting or activating a line.
Why carriers unlock phones
Unlocking lets consumers use an eligible handset with another provider without replacing the device. In a 2024 Federal Register notice, the FCC said that “mobile device unlocking facilitates consumer choice among mobile broadband providers by freeing consumers from having to replace their handset to use another network, thereby reducing switching costs.” The statement appears in the FCC notice.
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