My Apple 6 always reminds facetime what SMS charging is and how to turn it off.

That is, when activated, traffic or SMS may be used, which is a reminder function to inform users.

You can also turn off facetime in settings.

Apple's I-Phone 4, i-Phone4 4S, iPodtouch4 4th generation, iPad2 and ThenewiPad all have Facetime and iMessage functions. Facetime is a free video chat function software, which can connect any two Apple devices that support Facetime and realize video call through wireless network. Facetime does not need to set up a special account or account name, and it is very simple to use. For example, if you want to make a video call with a friend, just find her contact entry in the address book and click the Facetime button. In addition, if you may be having a voice call with a friend and want to switch to a video call at this time, just tap the FaceTime button on the phone screen. Either way, an invitation will pop up on your friend's screen and ask her if she wants to join your call. Once accepted, the video call can begin.

IMessage is an instant messaging software in iOS5 system released by Apple at WWDC20 1 1. It can send text, pictures, videos and so on. It is between iOS5 and Macosx 10.8 Apple devices, and supports multi-person chat. Users can only communicate through wireless networks or 3G networks. IMessage also uses the new message reminding systems of iOS5 and Macosx 10.8, which can directly push the information to the other party's screen, regardless of whether the other party is in a game or locked screen state. If both parties are using iMessage, there is no need to pay any SMS fee to the communication operator.