1, it's not impossible to use, but if it's used outside the province, it's roaming, and the charge is relatively high, so it's not cost-effective to continue using it;

If you are not in the province, it is suggested to change the number of your long-term location, and then send a message to all users of your original mobile phone book to inform them to change the number.

3. If you still want to keep the original number, you can use the dual-card dual-standby mobile phone to replace the old card with a cheap tariff package, and only keep the number; A new number for a long-term location is usually used.