Mobile Connect - This compact, rugged modem provides low-power, long-range cellular connections for fixed-location indoor and outdoor solar installations. This plug-and-play industrial-grade cellular modem supports systems of up to 60 microinverters. Select from the below models based on which operator provides the best coverage in your area. Enphase Mobile Connect - CELLMODEM-M1-06-AT-05 : LTE CAT M1 cellular modem with 5-year data plan from AT&T. Available in the US, Canada, Mexico, Puerto Rico, and the US Virgin Islands, New Zealand, France, Netherlands, Germany, Austria, Belgium, Switzerland, and Spain. For systems up to 60 microinverters.