I bought A21 two months ago as a business phone. Till now I am quiet satisfied with its performance. I use it as a business phone to check mails, click photos and net browsing on 3G network. Battery life is decent. It lasts for 2 days with normal 3G internet usage(around 1 hr daily). I mostly make voice calls and SMS. Camera is of 5MP but photos are comparable to Sony 3 MP.
It says A-GPS but there is no GPS transmitter to catch GPS signals like NOKIA N series phone.So will not give proper navigation. Voice quality and display is good. I have not used to play games so can’t comment on performance.
Installed Apps work smoothly. Overall value for money. Purchase recommended.