I had some trouble with my contacts doubling, then tripling. I could delete them on my contacts but they were still showing in the text message menu. I spoke with customer service and they couldn't help. I went in to a store and met a really knowledgeable guy who helped me out. I thought I'd share some of his tips here. For duplicate contacts: 1) Tmobile sync and Gmail sync FIGHT each other. Both should not be running at the same time. Turn off both for the moment. (You'll turn on gmail again in step 3). 2) Go into gmail and select contacts. Clean up the contact list by deleting the duplicates. 3) Go into the phone and turn on the GMail sync. Leave the TMobile sync off. Do not use it. For battery life: 1) Install the GPS on/off toggle app. Put it on your main screen. Keep GPS off unless using a map or navigation. Easily toggle on when using those functions 2) Turn off Tmobile sync (already done if you did the above). Turn off all automatic syncs that you don't use. Turn syncing to manual or the longest interval allowed between updates. HTH!