Which phones work with the ENC US SIM? China-model iPhones, single vs dual SIM, and how to check for carrier locks (2026)
The US T-Mobile physical SIM (ENC) works on iPhone 6S or later, whether bought in mainland China or overseas. It does not work on locked, jailbroken or sticker-unlocked phones or on Huawei phones, and for other Android phones you should email before ordering. Before you buy, spend 2 minutes checking three things: is the model new enough, is it unlocked, and does it take one SIM or two. The SIM cannot be returned once shipped, so confirming the phone first is the safe move. If your phone qualifies, the case is simple: $28 (about ¥199) including the first month's 30 minutes and 100 texts, a real T-Mobile +1 number, working after 3 steps and about 5 minutes.
On this page
- 1. The short version: will your phone work?
- 2. Check 1: is the phone unlocked?
- 3. Check 2: one SIM slot or two decides whether your Chinese SIM comes out
- 4. Check 3: iOS version and network
- 5. Why buy this SIM from LarkSIM
- 6. Why Android phones need a check first
- 7. Phone checked? You can order
- 8. FAQ
- 9. Related guides
Phone requirements follow the LarkSIM product page, and the dual-SIM model list follows Apple's support article as of 21 October 2026.
The short version: will your phone work?
| Phone | Works? | Notes |
|---|---|---|
| iPhone 6S or later, mainland China model | Yes | iPhones sold in mainland China are not carrier-locked |
| iPhone 6S or later, overseas or unlocked US model | Yes | Must be unlocked; a carrier-locked US iPhone will not work |
| iPhone 6, 6 Plus or older | No | The product page requires iPhone 6S or later |
| Locked, sticker-unlocked or jailbroken phones | No | Not supported according to the product page; do not order |
| Huawei phones | No | Not supported according to the product page |
| Other Android phones | Ask first | Email support@larksim.com before ordering |
| Apple Watch and other wearables | No | ENC says wearables are not supported |
Check 1: is the phone unlocked?
- 1
Open About
Go to Settings → General → About and scroll to Carrier Lock. - 2
Read what it says
"No SIM restrictions" means the phone is unlocked and will work. A carrier's name means the phone is locked to that carrier and cannot use this SIM (Apple Support). - 3
Look for a SIM sticker
Pull out the SIM tray. If a thin film sits between the SIM and the tray, it is a sticker-unlocked phone, which is really a locked phone, and this SIM does not support it.
ENC's own requirement is the same: the phone must be unlocked and pass its compatibility check. If unsure, dial *#06# to get the IMEI and enter it in ENC's device compatibility check.
Check 2: one SIM slot or two decides whether your Chinese SIM comes out
Apple says these iPhones bought in mainland China take two physical SIM cards: iPhone XR, XS Max, the 11 series, 12, 12 Pro, 12 Pro Max, 13, 13 Pro, 13 Pro Max, the 14, 15 and 16 series, 16e, 17, 17 Pro, 17 Pro Max, 18 Pro and 18 Pro Max (Apple: Dual SIM with two nano-SIM cards).
- check_circleDual-SIM iPhones: keep your Chinese SIM and the ENC SIM in at the same time. The Chinese number carries on with calls and data while ENC receives US texts over Wi-Fi Calling. This is the easiest setup.
- check_circleSingle-SIM iPhones: mainland China models from iPhone 6S to iPhone X, plus XS, 12 mini, 13 mini, the SE range and 17e, have one physical SIM slot. Take the Chinese SIM out to use ENC, and your Chinese number cannot receive texts meanwhile; you can swap back after receiving a code, and renewals and number keeping are unaffected.
- check_circleiPhone Air: the mainland China model is eSIM-only with no SIM tray, so it cannot take this physical SIM.
Check 3: iOS version and network
- check_circleiOS version: ENC recommends updating the phone to the latest system version before activation.
- check_circleNetwork: the first time you turn on Wi-Fi Calling you need an overseas network connection, as the product page states; after that, any Wi-Fi lets you send and receive texts and make US calls.
- check_circleNo signal after inserting the SIM is normal: in China this SIM does not use the cellular network and has no data, so it is not faulty.
Full steps are in the ENC Mobile activation guide; if it will not switch on, start with ENC SIM shows no signal.
Why buy this SIM from LarkSIM
If your phone qualifies, these are the reasons to order here:
- check_circleWorks on China-model iPhones: any iPhone 6S or later, mainland China or overseas, so no new phone needed.
- check_circleFirst month included: $28 (about ¥199) covers the first month's 30 US minutes and 100 US texts.
- check_circleA real carrier number: a T-Mobile +1 mobile number, not VoIP.
- check_circleTested before dispatch: shipped to your address in China and working after 3 steps and about 5 minutes.
- check_circleRenew with one email: email support before the plan ends; ¥66–99 a month.
Buy the US T-Mobile physical SIM (ENC) now: $28 (about ¥199) including the first month.
Why Android phones need a check first
In China this SIM receives texts over Wi-Fi Calling. Whether an Android phone can turn on Wi-Fi Calling for a T-Mobile number depends on the exact model and software, and brands vary a lot, which is why the product page asks you to email before ordering. Huawei phones are confirmed not to work.
When you email, include the brand, exact model and system version, and order once support confirms. If you have a spare iPhone 6S or newer, an iPhone is the safest choice.
Phone checked? You can order
Once you have confirmed iPhone 6S or later, "No SIM restrictions" and no SIM sticker, you can buy with confidence. The US T-Mobile physical SIM (ENC): $28 (about ¥199) including the first month's 30 minutes and 100 texts, a real T-Mobile +1 number, shipped to China and tested before dispatch, renewed by email.
Order the US T-Mobile physical SIM (ENC) now; if you are unsure about your model, email support@larksim.com before buying.
FAQ
Does the ENC US SIM work on a China-model iPhone?expand_more
Does it work on iPhone 6 or 6 Plus?expand_more
How do I check whether my iPhone is locked?expand_more
Do sticker-unlocked phones work?expand_more
Can a dual-SIM iPhone use my Chinese SIM and ENC together?expand_more
Do Android phones work?expand_more
Real +1 number · T-Mobile network · Card checked before dispatch
US T-Mobile physical SIM (ENC)
A real US +1 mobile number, not VoIP, delivered as a physical SIM to your address in China. Check the current price, Wi-Fi Calling and keep-number notes on the product page before ordering.