Bought a My Touch 3G during a TMo service renewal 20 months ago. The phone had been working fine until about a week ago. Normal cell battery standby was on the order of 5-8 days depending on any calls, my playing some games of Sudoku, etc. I rarely use the 3G/data service.
Then a problem developed when a fully charged cell phone would discharge in 12 hours or less. I conducted some observations on the 2.5-3 hour recharging effort and the 12 hour discharging anomaly. In each case 98% of battery consumption was Cell Standby and 2% Cell Idle.
Yesterday, I fully charged the phone, shut it off and removed the battery for 7 hours. When I put the battery back in the battery was still fully charged. I left as-is and got the 15% battery charge remaining warning after about 8.5 hours. Again, 98% of battery consumption was Cell Standby and 2% Cell Idle.
Next test will be to fully recharge it and power off the hone but leave the battery in the phone. After 7-12 hours I'll turn it back on and see if the battery is fully charged or drained a healthy fraction (or depleted). If it is fully charged on this test I'll perform a reset and see where that get's me.
The phone originally came with ANDROID 1.5 or older, and around the start of the year I updated to Froyo (2.2?). There have been no calls, text messages, no application installs or updates--phone literally sat there-- in the past week.
I would not recommend this phone, nor any HTC products. What good is a phone is it cannot last two years (for the contract). I see myself having to replace it with a $30 GSM-only phone until my contract is up. I am not renewing my TMo contract, because of the AT&T merger.
This is my first and last 3G phone.