I'm planning to come to China and buy a SIM card. I'll use it mainly for receiving OTPs because I'll try to open a bank account and will be using it outside of China as well to receive the OTPs.
I'll visit China once in several months.
My priority is:
Cost of maintaining the validity of the number long time (usage cost is irrelevant to me because I can use other international SIM cards, etc).
Ease of maintaining the validity (needing to extend it yearly is better than monthly).
Ease of topping up the balance (can be topped up through an English website / app compared to needing to visit an offline store).
Which SIM card is suitable for me?
Extra info: I will visit about 1-2 weeks, and I expect to be in China once or twice a year, or more as needed.