My mobile data service isn't working?

I have an iPhone 4s. I was experiencing an overheating problem with my iPhone and I read somewhere online that if you reset your network settings then it fixes the problem so that's what I did. However, now mobile data doesn't work. Everytime I try to use mobile data it now says 'Sorry, you are not subscribed to a mobile data service' or something like that.

How do I fix this? By the way, my carrier is JT-Wave

When my phone breaks (BlackBerry Curve) i just take everything out leave it for 5 minutes, and then put everything back in and restart it.usually works

I have a iPhone and when I switched the SIM cards it still has the same problem the data doesn't work.

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