What business does China Mobile handle to make it cheapest for couples in different places to call and send text messages?

If a family number is used in other provinces with a card from the same province, the call between family numbers is free of charge in this province, and the roaming fee in other provinces is 4 cents/minute, which is 6 cents.

I'll teach you a method, which is also the method I'm using. You and your girlfriend both have a card in the same city, and then join a group network. Calling the group network in the province is generally free, but it will be charged outside the province. Then, you need to make the card roaming to other provinces into a national free telephone package, so that you can call her home for free, because you use the group network, while the card from other provinces is free to receive and make calls nationwide, and it doesn't cost money, so that you can make calls for free.

I've been using this method, which is especially economical, that is, monthly rent. As for text messages, it doesn't matter. It's all 1 angle, I hope I can help you.

Wish you a happy life! ! ! ! !