A new icon appeared between the screen orientation lock and the bluetooth icons in my status bar. it looks like a phone over a keyboard. It appeared today after changing SIM cards, I switched to a new carrier.
It looks like this (the blue icon on the grey bar) :
My phone is not SIM locked and it is not jailbroken either.
No new applications have been installed and I made absolutely no change in the settings appart from the APN for Cellular data, MMS and tethering.
I'm not really worried, but simply surprised and I would like to remove it as it seems to serve no purpose.