Iphone always searching for signal?

I have an iPhone 4s. I updated to iOS 8 earlier today, but it made my phone so slow that I decided to go back to iOS 7. I restored my phone back to iOS 7, but now in corner it either says "searching" or "no signal". Also, when I go to my voicemail it says "visual voicemail is currently unavailable". I tried restarting my phone and it didn't help. What should I do? I really don't want to have to go back to iOS 8.

I would just go back to iOS 8 and wait for future iOS 8 updates. I'm on iOS 8 on my iPhone 5s and it is very slow and laggy, but I'm sure in the very near future, Apple will seed out future updates for iOS 8 which will greatly improve iOS 8. The same exact thing happened with iOS 7 first came out, then with time, Apple seeded updates to iOS 7, which greatly improved the performance of iOS 7.

My advice, go back to 8, enjoy the new features, and be patient for future updates to iOS 8.

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