Would the answer be different if:
1. TM sold us the phone 2 years ago.
2. It is showing serious signs of "old age". We have done a Factory Reboot - but still is showing signs of dying.
It is a My Touch 4G slide. My wife likes the phone and would pay to "rebuild it". Does TM (or HTC) sell rebuilt older phones?
Or, are we stuck having to learn a new phone - probably the S4. HTC is now emulating Apple and only sells phones that don't allow you to replace a dead battery (or have an SD slot).