Lenovo tab 7 4g video calling supported but its a not a comfortable. After using the Tab 7 for about 10 times, today I started to use it only to find out that the battery% dropped from 81% to about 29% in 10 minutes. about 30 minutes later it dropped to 16% and then I decided to plug it in. After waiting 2 hours of charging, the batt icon still showed 31%, or(was not charging) just holding at 24% while pluged into the AC/DC charger adapter and the original USB cable. Its brand new and this is my first tablet ever. Not sure what is causing this. Customer service is very worst. They do not answer emails and calls.