My phone has suddenly stopped having signal, It's never done this,and I can't call support due to no signal, HELP
Even if you could use your device to call about an issue, you are required to call from another phone so your device can be troubleshooted.
You will need to use a neighbors or friends phone or a payphone to call 800-922-0204 and choose the option for tech support. Be sure to have your phone with you.
That being said, be sure you did not place your device in Airplane mode in error.
Also try pulling the battery for a bit and then place back and power up and see what happens. Or it could be a tower issue nearby