I would like recommendations on what model Arduino board and what model 3G shield to use for a remote 3G cellular switch. Note: Digital output will run a 12vdc 100ma pump (or similar). Device is battery powered so energy efficient design is needed. I need them to be plug in to each other for assembly efficiency. Here is a description on what I want the "remote switch" to do: When the "remote switch" receives a SMS text "ON", the digital output goes high, then sends an SMS text "Confirmed ON". When the "remote switch" receives a SMS text "OFF", the digital output goes low, then sends an SMS text "Confirmed OFF". Notes: I want any phone to operate device and not have to set up "authorized phone numbers" Cellular signal strength should be able to be checked by sending SMS text "signal" and receive a response (or similar method).