How to update IOS 6.1.3 without Wi-Fi connection?

I'm using iphone 4s. The operating system IOS 6.1.3 is suggesting me for updating. But in our area we have no Wi-Fi zone. I use GPRS. Is it possible to update IOS using GPRS.

It is possible to update using GPRS.

But

You should know that the iOS download is close to 1 GB.
It may take a longer time, during which time, you don't want to do anything on your phone, otherwise you may have to start all over again, or worse

It would be a better idea to do it via iTunes. Over the air using cellular data will be a lot slower and may use up a lot of your allowance (if your data plan has one).