Yes, when you are in China, sim cards are readily available.
no because there from different countries
You can purchase a SIM card for your mobile phone in China at most convenience stores, mobile phone shops, or at the airport upon arrival.
You can buy a data SIM card for your device at electronic stores, mobile phone shops, or online retailers.
To purchase and use China Connect prepaid SIM cards for your mobile phone while traveling in China, you can buy them from authorized retailers or online vendors. Once you have the SIM card, insert it into your phone and follow the activation instructions provided. Make sure your phone is unlocked and compatible with the network. You can then add credit to the SIM card for calls, texts, and data usage while in China.
When you buy a tmobile phone it camoes with a sim card. If you already have a tmobile phone and break it you can buy a pre-paid phone and put your old sim card in it
You can buy a USA SIM card for your phone at most major electronics stores, mobile phone carriers, or online retailers.
You can purchase a Chinese SIM card for your phone at most convenience stores, mobile phone shops, or at the airport when you arrive in China.
Buy a SIM Card from AT&T or T-Mobile called a Micro-SIM. These will fit in the iPhone. Apple is planning on using Nano-SIM Cards which are even smaller.
NO
The best options for purchasing a China data SIM card for travelers are to buy one from a local telecom provider like China Mobile, China Unicom, or China Telecom. These SIM cards can be purchased at airports, convenience stores, or official stores of the telecom companies. Make sure to check the coverage, data plans, and prices before making a purchase.
Copy them on SIM card, then from SIM card on another mobile.
put it in the top slot or buy another sim card