I have been through three if these phones in the last 18  months.  Their life expectancy appears to be about 6 months.  Battery life is about same (as in - you have to buy a new batter for the darn thing about every 6 months). 

 I use an earpiece.  On the second phone, the earpiece evidently caused the phone to auto dial the last number I called - repeatedly... about once every 3 to 4 seconds.  Am suspicious that current phone has done same.

 All three of these have had a tendency to lock up (Can't dial or get it to even turn on.).  Cold booting it (taking the battery out) didn't...