Which card is the best for sending short messages in different places?

First, if you use PHS and he uses a mobile phone, it is suggested to use Unicom's new UP force, which includes short messages outside the network, and the M-Zone only includes short messages inside the network every month. Second, if you both use mobile phones, then both can. However, Unicom's UP new force has a close friend package, and two similar cards can make a close friend package, which is much cheaper. Please consult the operator for the specific two cards.