Will I owe money or just not get my device?

Today I applied for an iPhone 11 Pro Max.  AT&T made me pay 208.89 for the phone, but said they couldn’t run my credit at the time but will contact me if they run into a snag. My question is has anybody gone through something similar and what happened? Will I get the phone and owe like 500 on my first bill or will I need to pay upfront? I’m just worried because I did pay 208.89 for a phone and that’s without a credit check. On one hand I want the phone but on the other I don’t want to be told I owe more money on top of what I paid. I understand those were taxes and fees but I feel like if I entered my credit information shouldn’t it be ran in 30-60 seconds? I’m not trying to be a baby I’m just thinking I might have gotten a good deal on a phone and it seems too good to be true... I’m a broke college student so if I have 500 laying around unfortunately that has to go to school books and not fancy awesome phones. Also I did apply online and the phone is being shipped to me if everything actually works out...