iPhone buffering......Might be long but HELP

[thebandswife]

My husband has had constant issues with his phone. We thought it was the provider so we switched from Sprint to AT&T over the weekend. Went from iPhone 6's to 7's. He is STILL having the same issues that he had prior. Pandora, YouTube and other apps constantly buffer. He works in a warehouse and other people with the same phone AND the same service aren't having his issues. Is it possible it's him? Is it his settings? The cloud settings? I have gone through and set his phone up exactly like mine (I never have issues) and he is still suffering. Could he repel technology????? HELP!!!!!!