Excuse me, is it the best and most cost-effective to send SMS only to mobile?

Fetion is of course the most cost-effective, but it is more troublesome. First, if you want to send a free SMS, you must use Fetion client to send it for free. Of course, Fetion client has computers and mobile phones. Also, you must add the other person as a friend before you can send him a text message. Finally, the other party must be a mobile customer. In addition, applying for 5 yuan package is a package of GPRS traffic, not a package of Fetion, and Fetion itself is free if it does not join the membership. If Fetion is used on mobile phones, it will generate GPRS traffic, so you should apply for a package in 5 yuan. If you don't apply for a package, the traffic fee is very expensive.