How to know iphone is 4g&4s
 

You can check that on www.apple.com
Just use this link:https://selfsolve.apple.com/agreementWarrantyDynamic.do
and put you imei or serial number there and you will get an exact name of your iphone.

Thanks sir you can clear my problam

check in iphone operator finder .

you will get operator . and all info

1) hold the home button and if siri not available message appear then it is 4gs
2) check if black strip is there on the top if not that is 4gs

both are 4gs ???????