IPhone 4 won't download apps

I have an iPhone 4 and it won't download apps. I buy them, but when I try to download them, they get stuck on waiting, I've had iHeart Radia updating for a week now, and it still says waiting. I've turned my phone on and off many times, that won't work. And I tried resetting by holding the home and lock at the same time, and it still won't work. Anyone solve this yet? Also, i'm on mobile because I have no Internet in my house, I'm using my data plan.

Phones too full on memory, delete some stuff or you can reset your network settings, did it to mine and it works like it was new

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