Can telephone messages still be used after going abroad? How much will it cost? Someone called. Get through as usual? Will there be a hint that the owner is not in China?

If the GSM number can be used, if you are GSM and go abroad, it is equivalent to changing the local operating company, and you can use telephone messages. The cost is related to each specific local company. The network is optional. This network can release outgoing calls and change the network.

But it's expensive. Your home calls your number, you answer it and roam. Very uneconomical. A few days doesn't matter. Will not prompt whether it is in China.

Internet access is ok, but it's expensive. Internet access for foreign mobile companies is very expensive.