"This icon means that iPhone is able to use a TTY device. This function is off by default, and if you want to turn it off or on, go to Settings > Phone > TTY."The phone is not jailbroken. What does the symbol mean with the phone and squares under it? Thank you in advance
I suggest you read this page:What does that do? It is on my wife's phone which is very strange. Is it a messaging app aside from text or SMS?