IPhone5s sends video via SMS or how to charge, or needs traffic, or what is the situation in wifi environment?

All short messages are paid for communication, that is, telephone charges. Sending text messages is the same as making phone calls, and there is a charge, unless a lot of text messages are sent to you for free, which has nothing to do with wifi. The cost depends on the amount of information you send. 60 words each, that is 1 dime. A normally compressed photo counts as a multimedia message, which costs 3 cents. Sending video depends on how long the video you take, which is definitely more expensive than sending photos. Therefore, it is recommended that you use QQ or WeChat to send pictures or videos when you are connected to wifi, so there is no charge. I hope I can help you.