Keep your Chinese number, add a US number — at the same time

WeChat, Alipay, Taobao, your bank, your family group chat — they're all tied to your Chinese phone number. You can't cancel it. You also need a US number so US Uber drivers and hotels can reach you. The fix is dual-eSIM: both lines on one phone, simultaneously, no compromise.

How dual-eSIM actually works on a phone

Modern phones have two SIM "slots" that operate independently. They can be any combination of physical SIM + eSIM, or two eSIMs, depending on the model. Each slot has its own phone number, its own carrier, its own data plan, and its own settings. The phone listens to both simultaneously — incoming calls and texts can arrive on either line.

You choose, in settings, which line is the default for:

• Mobile data — usually the US line (faster, unlimited)
• Voice calls when dialing — depends on who you're calling (Chinese number for Chinese contacts, US for US)
• iMessage / FaceTime — usually US line so you can use it normally
• SMS — varies — most people let the system auto-pick based on who you're texting

The Chinese line just sits there receiving WeChat verification codes, Alipay codes, bank OTPs, and your mom's messages. The US line handles your day-to-day data and calls. Both are fully active, all the time.

Which phones support this?

iPhone

• iPhone XS, XR (2018) and newer — China models support dual-SIM (1 physical + 1 eSIM). Hong Kong / Macau models support 2 physical SIMs.
• iPhone 14, 15, 16 (US/international models) — dual eSIM only, no physical SIM tray. You'll convert your Chinese SIM to eSIM first (most Chinese carriers support this).
• iPhone 14, 15, 16 China model — keeps physical SIM tray for both, no eSIM. Works with dual physical, but doesn't take eSIMs — so you can't use our service directly on these. Workaround: ask your Chinese carrier to convert your number to eSIM, then add our US eSIM.

Android

• Google Pixel 4 and newer — physical SIM + eSIM
• Samsung Galaxy S20 and newer — physical SIM + eSIM (international models) or dual physical (some Asian markets)
• Xiaomi 13, 14 global — supports eSIM. Chinese-domestic versions of the same models often do NOT support eSIM.
• OPPO Find X6/N3, OnePlus 11+, Honor Magic5+ — typically support eSIM on global versions.
• Huawei — eSIM support is limited and varies by model. Check Settings → Mobile network → if you don't see "Download a SIM," it's not supported.

Step-by-step: setting up dual-SIM for the first time

iPhone (most common case)

1. Make sure your Chinese SIM is already inserted and active. Confirm by sending a text to a friend.
2. Buy a US plan from MeiSIM USA. You'll get an email with a QR code.
3. Open Settings → Cellular → Add Cellular Plan.
4. Scan the QR from the email. The eSIM installs. iPhone will prompt: "Default Line" — pick your Chinese number (so existing calls stay on it). "iMessage & FaceTime" — pick the line where most people already know you. "Cellular Data" — pick US line (this is the important one).
5. Optional: rename the lines for clarity. Tap each line → "Cellular Plan Label" → "China" / "USA".
6. Done. Both lines now appear in the status bar (two signal indicators top of screen).

Android (Pixel/Samsung example)

1. Confirm your Chinese SIM (physical or eSIM) is active.
2. Buy a US plan. You'll get an email with a QR code.
3. Open Settings → Network & Internet → SIMs → Add eSIM (Pixel) or Settings → Connections → SIM card manager → Add Mobile Plan → Scan QR (Samsung).
4. Scan the QR. eSIM installs. The OS will ask which SIM is "Preferred for mobile data" — pick US line.
5. Rename lines so you don't mix them up. SIM card manager → tap each line → name.
6. Done. Both lines appear in the status bar.

The WeChat / Alipay question — will they still work?

Yes. WeChat, Alipay, Taobao, JD, your Chinese bank, your university WeChat group — all tied to your Chinese phone number, not your location or active network. As long as that number is on a line that exists in your phone, you'll keep receiving the SMS verification codes from these apps via your Chinese carrier's international roaming.

The catch: each WeChat OTP costs your Chinese carrier a small international SMS fee. China Mobile/Unicom/Telecom charge ¥0.50–1 per received SMS abroad. If you log into WeChat once and stay logged in, you'll get maybe 2–3 OTPs per month — that's ¥5/month max. If you log in/out constantly, more. Set your Chinese SIM's data roaming to OFF in phone settings (you don't want it doing data on Chinese roaming — that's where the real costs come from) but leave it active for SMS.

Common confusing situations

"Both lines are ringing for the same call"

That's call forwarding doing its job — if you set up your Chinese number to forward calls to your US number while abroad, both phones (well, both lines) ring. You can disable forwarding via your carrier's app or **5*XX#** USSD codes. Or just answer on either line — they'll both pick up the same call.

"My US texts aren't sending to Chinese friends"

SMS between US and Chinese numbers is unreliable — works one direction, fails the other, depending on carriers. The fix: use WeChat for messaging Chinese friends. Use SMS only for US-format numbers.

"My phone is using too much data — but I have unlimited US"

Check: Settings → Cellular → Mobile Data on iPhone. Make sure it says US line not Chinese line. If you've set it to Chinese line, every byte you use is on international roaming and costs ¥0.05/KB — a thousand times more expensive than your US plan.

If you don't have a Chinese SIM yet

If you haven't been to China yet but you have Chinese contacts/family/employer needs, you can also get the OPPOSITE setup: keep a US SIM and add a Chinese eSIM. Same principle, different vendor. Look for "China Mobile eSIM" or "China Unicom CUniq" — they offer prepaid Chinese eSIMs that ship to international addresses. Note that some apps (banking, government) require Chinese real-name registration (实名认证) — that's a separate hurdle.