Default [Q] Trouble with internet connection, EDGE only

I'm having an issue with my internet connection. I have a Galaxy S3 (SGH-I747) running Slimbean custom rom (Android 4.3). It's an AT&T phone which I unlocked. I am in Egypt right now on the Etisalat network.

I am only getting EDGE connectivity right now. I tried talking to technical support but all my settings seem to be in order. I checked all my settings multiple times (APN, Mobile data, etc) and everything should be ok. My sister has the same phone with the same software and phone line and she is getting 3g speeds. I tried switching our SIM cards to see if the problem is with my SIM card. Her phone was still showing 3g speeds and mine was only getting EDGE.

Does anyone have experience with this or advice for solutions? Any help would be greatly appreciated