How to cancel the ringtone sent by IPHONE SMS?

That is the default system sound when the iphone edits and sends and receives text messages by itself, and there is no way to eliminate it. My 3GS also has it.

I used to use 1 generation, and I still have it.

There is no way to cancel.

Unless you mute your phone or set it to vibrate,

And then there was nothing.

Even if you break out of prison, you still have this sound.

But this kind of sound will only appear when you receive information from others, such as when you edit a short message or when you send a message.

If the phone is in standby state, or when you are playing iphone, the message you receive is your default "glass" sound.