Unlocked AT&T Iphone 4s with striaght talk?

I bought an unlocked at&t iphone 4s. On straight talks website when you go to buy a sim card it gives you these options:

Phone is a CDMA (i.e. Verizon, Sprint, Metro PCS), TracFone, SafeLink, NET10, Straight Talk, Telcel America or BlackBerry
Unlocked GSM Phone (Phone must operate in 850 and 1900 MHz bands)
AT&T Compatible Phone
T-Mobile Compatible Phone

Which one do I choose to get the right sim card to fit the iphone 4s

In your opinion what is a better plan?

Virgin mobile - 35 dollars a month, free texting and picture messaging, free calling from 6 pm and free on weekends.pay as you go data wich is 15 dollars for 300 mb, and 20 for 1 gb ect but paying 700 dollars for iphone. No contract though.

fido - 45 dollars a month, free texting, free calling from 5 pm and weekends. 200 mb of data, 80 dollar iphone or free, 3 year contract.

I won't use much data since I always have Wi-Fi. I probably will never use it actually but it would be nice to have some in car or something.

Unable to get mail on iPhone/mobile devices?

I'm unable to receive emails on my iPhone. A friend with a droid is also having same problem. We have both removed and added back our accounts, but we can't get incoming mail. Any help appreciated!

Why is my data usage so high after switching to At&T?

When I had my iPhone 4 with Verizon, I used roughly 300MB of data per month. I recently upgraded to the iPhone 5 and switched to AT&T. Yesterday, at the end of the FIRST DAY of the billing cycle, I checked my data usage --- 500MB! I was barely on the phone at all yesterday. I probably checked Facebook 3-4 times and refreshed my twitter feed a couple times as well. I get about 50 e-mails per day. Can anyone tell me why this is happening?

Having problems with my iphone

So yesterday i was trying to delete the songs off my Iphone and I accidentally hit sync, and a few songs were synced in the iphone, and i couldnt delete the songs cause the songs suddenly disappeared without me doing anything! Then when I checked the iphone the songs that got synced were there and all the other songs were also there but you can't play them at all! You can't even click them (they're there but unclickable). Now I just wanna get rid of all the songs on the iphone but I can't cause Itunes is not showing me the songs:/ what's going on! Anyone help please!

What's the best iPhone to get?

For Christmas, I really want to get an iPhone (with my own money) and I'm wondering what iPhone is the best? I don't know about the iPhone 5 because of the money. What iPhone is the best to get and money wise?

Iphone 5 4G Lte not working?

Ok so i just got the I phone 5 yesterday on contract, which should have 4G. However it only says 3G at the top and when i go onto settings, in the cellular data it says enable 3G which is turned on. Iv looked on the internet and this should say enable Lte, or at least that's what other peoples I phone 5's. Why does mine say enable 5G and how can i fix this, if there's indeed something to be fixed.