How to sell mobile phone cards in Tianjin in different places?

It is impossible to sell the number in different places. I suggest you change to an easy card with no monthly rent and no minimum consumption. No money. After the expiration of the validity period, the number will be cancelled. You can transfer the balance to another number when you return to Tianjin in the future. Call 022 10086 in other places and follow the voice prompts, or edit the short message 10086 and send it to 10086 and reply according to the sent short message (this is free, and roaming charges are charged according to the call).