Is it safe to update to ios 7.0.3?

I really want to update my sprint iphone ios 6.1.3 to ios 7.0.3 but i'm scared that if i update it it will make me lose my gpp unlock. Will it bring me back my sprint service if i update it?

If you have not unlocked the phone legitimately, upgrading to a new version of iOS is likely to reinstall the lock.

Yes it is safe… Just make sure do some back up before proceeding update

It more than likely would do that.