Not able to login in Gtalk when using GPRS connection working perfectly when using WIFI connection I am using a Samsung Galaxy S2. I am not able to log in to Gtalk or Gmail. The apps cannot load conversations when using a GPRS connection (error message: could not connect to server). But when I access Gmail through the browser using GPRS it works perfectly. Internet runs perfectly without any error.

Also these apps works perfectly when using a Wifi connection. Any suggestions on what the problem might be?
Besides being an APN issue, as pointed out by Aadi, it could also be that your current mobile contract does not allow some type of mobile communication (like GTalk). You should contact your mobile carrier and ask him.