Carrier:
| "att"
| "tmobile"
| "verizon"
| "sprint"
| "cricket"
| "uscellular"
| "metropcs"
| "boost"
| "virgin"
| "googlefi"
| "xfinity"
| "straighttalk"
| "pageplus"
| "ting"
| "consumercellular"
| "republicwireless"
| "simplemobile"
| "rogers"
| "bell"
| "telus"
| "fido"
| "koodo"
| "sasktel"
A known carrier provider key in CarrierGateways.
Lowercase provider identifiers covering US + Canadian carriers. Pass one to smsAddress / sendSms, or pass a raw gateway domain for any carrier not listed here.