So far I've always used a GSM modem to send data in the form of SMS messages.
GSM modem -> 2G technologies
plan B. upgrade it to 4G Wimax, 30 to 40 megabit-per-second data rates, and 34 mb seem is the standard. Operating at the maximum range of 50 km (31 mi). to make 4G Wimax working with Arduino is easy. use Raspberry PI as shield connect with Wimax USB stick, and connect Raspberry PI via USB to Arduino. It works for me.
Now we have big problem, Did we have enough data, 10mb/s to transfer?