Unlock a T-Mobile iPhone Before You Sell It

T-Mobile unlocks an iPhone when 3 conditions are met: the device is paid in full, it has been active on the T-Mobile network for the minimum period in T-Mobile's published policy, and it is not reported lost, stolen or linked to fraud. T-Mobile's policy lists a 40-day active period for postpaid devices and a 365-day period for prepaid devices, and customers request the unlock through T-Mobile's support channels. An unlocked iPhone earns the full offer, while a locked iPhone earns a locked offer. Compare the two on Sell Locked iPhone for Cash before deciding whether to wait.

Postpaid rule: paid in full and active on the network for at least 40 days.
Prepaid rule: active for at least 365 days.
How to request: T-Mobile customer care, the T-Life app or T-Mobile's website.
Result check: Settings > General > About > Carrier Lock shows "No SIM restrictions".

What are T-Mobile's unlock requirements?

T-Mobile's unlock requirements, as published in its device unlock policy, cover 4 conditions. The table summarizes them.

Requirement	Postpaid devices	Prepaid devices
Payment	Device paid in full, including any Equipment Installment Plan (EIP)	Device bought outright
Active period	At least 40 days on the T-Mobile network	At least 365 days
Status	Not reported lost, stolen or blocked	Not reported lost, stolen or blocked
Account	In good standing	In good standing

T-Mobile's device unlock policy page is the authoritative source for current terms. Policies can change, so check the page before planning a sale around an unlock date.

How do I request a T-Mobile unlock?

Request a T-Mobile unlock in 5 steps:

Confirm the device is paid off in the T-Mobile account or the T-Life app.
Find the IMEI in Settings > General > About, or dial *#06#.
Contact T-Mobile through the app, the website chat or customer care, and request a device unlock.
Provide the IMEI and the account details requested.
Wait for the confirmation, then connect the iPhone to Wi-Fi and restart it.

The iPhone applies the unlock when it connects to Wi-Fi or activates another carrier's SIM or eSIM. Check the result in Settings.

How long does a T-Mobile unlock take?

A T-Mobile unlock request is usually processed within a few business days, and the iPhone applies the unlock within minutes of connecting to Wi-Fi after approval. Requests submitted before the active period ends are declined and need to be submitted again after the period passes. A quote stays valid for 14 days, which usually covers the processing time.

Can I sell a locked T-Mobile iPhone?

A locked T-Mobile iPhone can be sold at a locked offer, which is lower than the unlocked offer for the same model and condition. The table compares the options.

Phone status	Better choice
Paid off, active 40 days or more	Request the unlock first
Paid off, active fewer than 40 days	Wait for the period, or sell locked
EIP balance remaining	Compare the unlocked offer minus the payoff with the reduced offer
Reported lost or stolen	Not bought

Can You Sell a Carrier-Locked iPhone? Yes, Here Is How explains locked offers in detail.

How do I check whether my T-Mobile iPhone is unlocked?

Check whether a T-Mobile iPhone is unlocked in Settings > General > About. The Carrier Lock line reads "No SIM restrictions" on an unlocked phone. A locked phone shows a SIM lock message. How to Tell If Your iPhone Is Unlocked Before Selling explains other checks, including testing with another carrier's SIM.

How does an EIP balance affect the unlock?

An Equipment Installment Plan (EIP) balance blocks the unlock until it is paid. Pay off the balance in the T-Mobile account, wait for the payment to post and then request the unlock. Paying off a phone that receives monthly promotional credits can end those credits under the offer terms. T-Mobile Trade-In for iPhone: Credits, Rules and Alternatives explains how credits work.

Why was my T-Mobile unlock request declined?

A T-Mobile unlock request is usually declined for 1 of 4 reasons:

The device still has an EIP or lease balance.
The device has not met the active period on the network.
The IMEI is reported lost, stolen or blocked.
The account has a past-due balance.

Resolve the stated reason and request the unlock again.

Do Metro by T-Mobile iPhones follow the same rules?

Metro by T-Mobile, the prepaid brand, publishes its own unlock policy, with an active-period rule for prepaid devices. Metro phones commonly stay locked longer than T-Mobile postpaid phones. Check Metro's unlock page for current terms. Prepaid Carrier iPhones (Cricket, Metro, Straight Talk): Can You Sell Them? covers prepaid phones.

Can former T-Mobile customers unlock an iPhone?

Former T-Mobile customers can request an unlock when the device was paid in full, met the active period while on T-Mobile and is not reported lost or stolen. Contact T-Mobile customer care with the IMEI and the former account details. The closed account must have no past-due balance.

What about T-Mobile iPhones bought as part of Sprint?

Sprint merged with T-Mobile in 2020, and Sprint devices and accounts now follow T-Mobile's policies. Older Sprint-branded iPhones that are paid off and active can be unlocked through T-Mobile. Many of these phones are older models, such as the iPhone 11, which still have resale value in working condition. Is My Old iPhone Worth Anything? Selling Older Models covers older models.

Does an unlocked T-Mobile iPhone work on AT&T and Verizon?

An unlocked T-Mobile iPhone works on AT&T, Verizon and other U.S. carriers, because U.S. iPhone models support the bands used by all major networks. Activate the new carrier's eSIM, or insert its SIM card on models with a tray. U.S. iPhone 14 and later models use eSIM only.

What should I do after the unlock?

After the unlock, complete 5 steps:

Confirm "No SIM restrictions" in Settings > General > About.
Request a quote with the carrier status set to unlocked.
Back up the phone and transfer data to the new phone.
Turn off Find My, sign out of the Apple Account and erase the phone.
Ship with the free prepaid tracked label within the 14-day validity.

How to Prepare Your iPhone to Sell: 9-Step Checklist covers each step.

Is unlocking worth it before selling?

Unlocking is worth it before selling whenever the phone already qualifies, because T-Mobile does not charge for eligible unlocks and the unlocked offer is higher. When the phone needs a payoff first, compare the unlocked offer minus the payoff with the reduced offer for a phone with a balance, and choose the higher net amount.

Can a third-party service unlock a T-Mobile iPhone?

Third-party unlock services cannot change T-Mobile's records reliably, and some are scams that take payment without results. The carrier's own unlock is free for eligible phones. A phone that does not yet qualify can be sold at a locked offer instead.

What information should I have ready?

Have 4 items ready before contacting T-Mobile: the IMEI, the T-Mobile phone number, the account holder's name and the account PIN or verification details. For a family or business account, the primary account holder or administrator may need to approve the request. Selling an iPhone on a Family or Business Carrier Plan covers shared accounts.

What is the timeline from purchase to unlock?

The timeline from purchase to unlock depends on how the phone was bought. The table shows typical paths.

Purchase type	Earliest unlock
Bought outright on postpaid	After 40 days active on the network
EIP, paid off early	After the payoff posts and the phone has 40 days active
EIP, paid to term	After the final installment posts
Prepaid	After 365 days active
Leased device	After the lease purchase option is paid

How do the 3 major carriers' unlock rules compare?

The 3 major U.S. carriers set different unlock rules. The table compares them, based on each carrier's published policy and, for Verizon, reports on its January 2026 change.

Carrier	Postpaid rule	Prepaid rule	How it unlocks
T-Mobile	Paid in full, 40 days active	365 days active	On request
AT&T	Paid in full, 60 days active	6 months of paid service	On request at att.com/deviceunlock
Verizon	Bought after January 27, 2026: locked until paid off	365 days for prepaid brands	Automatically

How to Unlock an AT&T iPhone Before Selling and How to Unlock a Verizon iPhone Before Selling cover the other carriers.

What should I do if the unlock does not apply?

When an approved unlock does not show on the iPhone, complete 4 checks: connect to Wi-Fi and restart the phone, update iOS, activate a SIM or eSIM from another carrier and check Settings > General > About again. When the lock remains after 24 hours, contact T-Mobile with the IMEI and the approval confirmation.

Can I unlock several T-Mobile iPhones at once?

Several T-Mobile iPhones on one account can be unlocked with a request for each IMEI, once each phone meets the payment and active-period rules. Families selling several upgraded phones can submit the requests together and ship the phones in one box. Sell iPhones in Bulk covers groups of 10 or more phones.

Does unlocking erase the iPhone?

Unlocking does not erase the iPhone or change its data, because the unlock is a change in carrier records linked to the IMEI. Erasing is a separate step done before shipping the phone for sale.

What happens to the phone number after the unlock?

The phone number stays on the T-Mobile account after the unlock. Moving it to another carrier is a separate port request started by the new carrier. Keep the T-Mobile line active until the port completes, so calls and texts continue during the switch.

Is a locked T-Mobile iPhone worth selling now?

A locked T-Mobile iPhone is often worth selling now when the unlock is months away, because the phone loses value each month and a large drop follows Apple's September launch. Compare the locked offer today with the expected unlocked offer later. Best Time to Sell Your iPhone Before Prices Drop explains the calendar.

Which records help with a T-Mobile unlock?

Three records help with a T-Mobile unlock: the purchase receipt or EIP agreement, the payoff confirmation and a screenshot of the Carrier Lock line in Settings. Keep them until the phone is sold and paid.

Does a T-Mobile unlock affect Apple Account settings?

A T-Mobile unlock does not affect the Apple Account, Find My or Activation Lock, because those are Apple services separate from the carrier. Turn off Find My and sign out before selling.

Frequently asked questions about unlocking a T-Mobile iPhone

What are the requirements to unlock a T-Mobile iPhone?

T-Mobile's published policy requires the iPhone to be paid in full, active on the T-Mobile network for at least 40 days on postpaid or 365 days on prepaid, not reported lost or stolen and on an account in good standing. Check T-Mobile's device unlock policy page for the current terms before planning a sale.

How do I request an unlock from T-Mobile?

Request an unlock through the T-Life app, the T-Mobile website chat or customer care, with the IMEI and account details. After approval, connect the iPhone to Wi-Fi and restart it, then check Settings > General > About for "No SIM restrictions" under Carrier Lock to confirm the unlock applied. A free quote with these details shows the exact offer, which stays valid for 14 days.

How long does it take T-Mobile to unlock an iPhone?

T-Mobile usually processes an eligible unlock request within a few business days. After approval, the iPhone applies the unlock within minutes of connecting to Wi-Fi or activating another carrier's SIM or eSIM. Requests made before the active period ends are declined and must be submitted again later. Testing within 1–2 business days of arrival confirms the result before any payment is sent.

Can I sell a T-Mobile iPhone that is still locked?

A locked T-Mobile iPhone can be sold at a locked offer, which is lower than the unlocked offer. A phone with an EIP balance earns a reduced offer from the account holder, with the balance staying on the T-Mobile account. Phones reported lost or stolen are not bought by legitimate buybacks.

Does T-Mobile charge to unlock an iPhone?

T-Mobile does not charge to unlock an eligible device. The only cost is any remaining EIP or lease balance, which must be paid before the unlock. Paying off a phone that receives promotional bill credits can end those credits, so read the offer terms before paying the balance early. Payment follows 1–2 business days after testing, by PayPal, Zelle or bank transfer.

Sources and references

T-Mobile: device unlock policy and support pages.
Metro by T-Mobile: device unlock policy.
Apple Support: how to unlock your iPhone for use with a different carrier.

How to Unlock a T-Mobile iPhone Before Selling