I recently switched from an Android phone to my first time use of an iPhone. I bought an iPhone 5c from Straight Talk. But, I don't know which carrier tower my phone is using. I have no idea if it is using CDMA or GSM. Is there a way to know by looking in the phone settings? I contacted ST, but it seems they are so secretive about this. I looked at the field test on my phone but it was difficult to decipher. Any suggestions?