The cheapest thing that makes China easier is not a tour guide or a translation app — it is a China SIM card. With a mainland number you can register 12306 for trains, unlock a shared bike, order a Didi, and receive the 验证码 (six-digit SMS code) that every app asks for at least twice. Without one, you are a person who has to find hotel Wi-Fi before you can buy lunch. This is the counter-to-working-data sequence I have now run four times: twice at Chengdu Tianfu International Airport (TFU), once at a small China Mobile 营业厅 in a Chengdu suburb, and once at Beijing Capital.
What to hold in your hand before you queue
- Your actual passport — not a photo of it, not a copy. The clerk scans the photo page and usually the entry stamp too.
- An unlocked phone. A handset still tied to a contract at home may refuse the new SIM outright. Check this before you fly; it is the number one reason people walk away empty-handed.
- An address in China. Your hotel's name and room number is enough. The card from the front desk, with the address printed in Chinese characters, saves a lot of spelling.
- A payment method that works. Counters take WeChat Pay, Alipay and cash; several do not take foreign cards at all. Bring ¥200–300 in cash.
- About 20 minutes once you reach the front of the line.
Step 1: Walk past the rental kiosks and find the carrier counters
In the arrivals hall of any big airport you will see three names: 中国移动 China Mobile, 中国联通 China Unicom and 中国电信 China Telecom. Ignore the pocket-WiFi rental desks next to them — that is a different product for a different problem.
Timing matters more than which counter you pick. At Chengdu Tianfu I counted two people ahead of me at 21:40 on a Tuesday and nine at 07:20 on a Sunday. Airport tourist plans run maybe ¥20–40 a month above city prices, but the staff handle passports all day. Arriving late or staying under two weeks? Buy here. Staying a month or longer, take a starter plan and revisit a proper 营业厅 later.
Step 2: Ask for data first, minutes second
Say 流量 (liúliàng, mobile data) before you say anything else. A plan with lots of voice minutes and little data is a plan built for a different decade. My own usage across 30 days in Chengdu came to 21 GB: maps every day, Didi most days, a lot of video, and tethering to a laptop twice a week. A 10 GB plan of mine ran dry on day 22.
Ask "有没有流量多的套餐？" and read the number on the clerk's screen, not the poster — posters advertise the discounted first month.
Step 3: Real-name registration — the 15 minutes you cannot skip
实名登记 is not optional and not a formality anyone will waive: every Chinese number is tied to a verified identity. Expect a passport scan, a face scan (you stand in front of a small camera and look at it), sometimes a fingerprint, and a paper form asking for an address and your occupation. The form's 详细地址 line wants something specific — your hotel's address works, "China" does not.
Photograph the paper they hand back. It has your new number printed on it, and you will need that number three times before you leave the terminal.
Step 4: Insert the card and fix the one setting that blocks data
Most phones sort themselves out in about thirty seconds. When they don't, it is almost always the APN field. China Mobile uses cmnet, China Unicom uses 3gnet, China Telecom uses ctnet. On iPhone it sits under Settings → Cellular → Cellular Data Network → APN. Type it in, toggle airplane mode for five seconds, and watch the little symbol appear next to the carrier name.
If you have a dual-SIM phone, put the China SIM in the physical slot and keep your home number on eSIM. Your home number is still the one your bank sends security codes to, and you do not want to discover that at baggage claim.
Step 5: Bind the number on day one, while you can still read the SMS
WeChat, Alipay, Didi, Meituan and 12306 all want a mainland number, and all of them verify it with a 验证码 that expires. Do it sitting on a bench near the counter with the paper in front of you. Doing it later — at midnight, in a hotel room, after the first code has expired and the second one has gone to the wrong app — is the version of this story that ends with no ride to the airport on your last morning.
Step 6: Top up before it empties, and close it before you fly out
Topping up takes under a minute: in WeChat or Alipay open 手机充值, type your own number, pick an amount, pay. Note that balance and plan validity are two different things — my plan renewed on the 8th of each month regardless of the day I landed, so my first "month" lasted eleven days.
Before you leave the country, take your passport to a 营业厅 and ask to 注销 the number — free, fifteen minutes. A prepaid card quietly stops working, but a postpaid one keeps billing, and the unpaid balance is attached to the passport you plan to travel on again.
The three places people actually get stuck
- The phone is network-locked. Common with contract phones bought at home. Nothing at the airport can fix it — the unlock has to happen with your home carrier, before you fly.
- The phone has no physical SIM tray. eSIM-only models cannot take a Chinese SIM card at all. If that is your phone, the right answer is a travel eSIM purchased before you board, not a counter.
- The payment loop. You need data to pay, and you need to pay to get data. Cash breaks the loop. So does asking the clerk to show a QR code on their own screen.
What it costs and how long it takes
| Item | Typical cost | Time |
|---|---|---|
| Airport tourist plan (30 GB / 30 days) | ¥100–200 | 5–10 min at the counter, plus queue |
| City plan, bought at a 营业厅 | ¥40–80 per month | 15–25 min |
| My last plan — ¥58/month, 30 GB, 200 minutes | ¥58 | 22 minutes, door to working data |
| Top-up in WeChat / Alipay | Any amount, ¥50 minimum usually | Under 1 minute |
| Closing the number before leaving | Free | 15 min at a 营业厅 with passport |
The ¥58 plan was more than I needed — I used 21 GB of those 30 — but it cost less than two airport coffees a month and removed every "do you have data?" moment from the trip. That is the whole argument for doing this on day one.
Twenty-two minutes, ¥58, one form. Everything you want to do in China — pay, ride, book, order — is behind a six-digit text message, and this is how you get one.