I have an iPhone 4 and everytime i try to go on safari, mail, or iTunes it does not work without wifi

I have an iPhone 4 and everytime i try to go on safari, mail, or iTunes it does not work without wifi

if your youtube was already running then I would exit out of the application completely by double clicking your home button and then search for your youtube app on the row that will show below and then press and hold down the youtube icon and then click the "X" to exit out of it. Afterwards try to reopen youtube and play a video to see if it works

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