I purchased new blackberry 8310 from india mumbai...it was locked with AT&t USA i get it unlocked & i m using Vodafone india....when i git unlocked it EDGE was working perfect...but suddenly after 1 month it stped & now on screen "EDGE" comes to "edge" & i mnot able to use it...when i put my card in other blackberry device its working fine with on screen capital EDGE...but when i put my card in my BB 8310 on screen its small edge...what is the problem with this handset....pls help me out from this problem experts pls reply....thank you .......yogesh.....

I assume that you have a BB data plan?

What did you do just before it went to lowercase "edge"? Did you install any new software, delete or otherwise make any changes?

With the device on, pull the battery for about 30 seconds, then reinsert and let it reboot. That should fix it.