So I have a Galaxy Mega 6.3 LTE version. Its model number is SPH-L600. It runs on sprint (well did). Anyways so I rooted this phone and installed PhilZ Touch recovery. I installed CM11 but then quickly realized that I didn't have sprint service anymore. I thought before I did this that it'd be a good idea to back up the efs.img, which I did. So I have the efs image thinking I could use this to restore my service back if I put my phone back to a stock rom (which I did), but it still won't work! The IMEI is still good, it's not a lot of 0's or anything, so that's still good. FYI I used Odin to do the rooting process and such. Any help would be much appreciated because I'd like to have my phone service back!