[Q] No service on OnePlus One after flashing a backup on TWRP. topic

Here comes the info. So, I rooted my OPO and wanted to install a custom ROM. I first, as recommended, made a backup image on TWRP. I then downloaded Paranoid Android 4.6 Beta 6 to try it out. Used for a couple hours, and then decided to flash the OPO AOSP ROM directly from the OnePlus website. This is where everything went wrong. My phone was stuck in a bootloop after rebooting from flashing the ROM. So, I went back into TWRP and flashed the backup image I had made, afraid I was going to brick my phone. Once the backup had installed and I had booted into it, I had no service. I tried removing my SIM card, and placing back in, I checked and I was NOT in airplane mode. I became quite irritated, so I formatted data in TWRP. I then placed a zip on my phone from my computer of a CM12 Rom. I flashed that and still have no service. How do I regain service? Is it a problem with my phone or my SIM? Please Help.