I need cellphone help. Iphone 4?

I'm a carrier for Sprint, I have an Iphone 4, 8gb, and I noticed that neither my data or Wi-Fi will download apps as fast as it should. It takes about 20-30 minutes for each app to finish downloading. So yesterday, I took it to MacExperience, an Apple repair shop and got another iPhone as replacement, and this one is doing it too! What could be causing this? Or could it just be Sprint's network. It just doesn't make sense to have two phones in a row doing the same exact thing.

Maybe they're running old software? Or your phone memory is filling up

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