What will happen if you never upgrade your iphone?

Will something go wrong with your phone. Can I still get updates on my apps if I don't upgrade. I'm so scared about the new upgrade do I have to upgrade it. If I never upgrade my phone what is going to happen to my phone. My friend told me it is very good to upgrade your phone is that true. Do you have to upgrade your phone because I really don't want to upgrade and my friend is putting a lot of pressure on me so that I can get it but I really do not want to get it. I saw what it look liked and I really did not like it. Do I have to upgrade. If I don't upgrade can I still get the updates for my apps. If I don't will my apps still work well if I don't upgrade it to the ios 7. I feel like my friend is forcing me to get it what should I do with this problem.

If you don't upgrade your phone will function the same as it does now. You will still get updates for apps.

In the short term if you don't upgrade things will work fine. As time goes on and app publishers and apple start writing everything for the new OS, your phone will slowly loose usability. Software companies write to the latest OS on any device, that's why most people choose to upgrade.

It will work perfectly well, but you might miss out on some new stuff