I got it today. My samsung galaxy ace keeps connecting to the GPRS evey 10 minutes or so and then balance is reduced each time because of data charges. I figured out a temporary solution to this.. I went to settings > wireless and networks > mobile networks > and then i turned off "use packet data option" that way my mobile will not be able to connect to GPRS unless i Turn on "use packet data option". But each time i want to use GPRS i have to turn on the "use packet data option" and then turn it off when not in use. Any solution to this problem.