How to activate iPhone 5S to AT&T's network?

I recently got a factory new replacement iPhone since my old iPhone broke. There isn't an easily accessed AT&T store nearby that I can use to activate it, and since my phone is on a company line, the Apple Store can't help me. I tried activating it online but you need an AT&T account which doesn't allow company or business accounts. Also, my phone can't call anyone so I can't call the AT&T number. Any help or ideas?

You would definitely need to contact AT&T. And if you dial 611 from your phone it should connect you with AT&T

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