Google Voice - Make cheap international calls with your Google number. Send free text messages.Place calls and send text messages showing your Google number. Listen to voicemail and read transcripts. Currently only available in the US. IMPORTANT: You must open Google Voice at least once after upgrading to route calls
ShaPlus Mobile Info - this is a freeware to find the location (Region/state) and cellular operator of any given Mobile number (Indian numbers only). Mobile number can be either entered (at least first 4 digits) or can be selected from the mobile's contacts list.
This is an offline application, no need of internet connection(GPRS) to function