Whatsapp is best chat masenger. you can chat with your frnd in low date also in whatsapp.and you cant got msg in whtaspp when you are offline but your net is on.if your net is off you candm recived msg after you trnd on your net connection. you can call also in whatsapp in india. but some other country u cant do that bcoz there are no options for call in that cauntries. you can group chat also in whatsapp. you can make your on group in whtaspp also for your chanel and brodcast. and easyli you can contece your freinds. go to https://whatspp.com and dowload it now. wellcome to the whatsapp.