For example, prices for GSM Arduino shields currently are ranging between $71 and $118! The actual numbers for data exchange rate, however, are not that high and typically are in the vicinity of 9.6 Kbps for 2G networks. The challenge can be addressed by using a WiFi module in those areas with WiFi coverage being available but what if it is not an option? Then there is no other choice but GSM (also referred as 2G) module which substantially elevates the cost of overall solution and yet it is incapable of providing communication speed high enough for many nowdays needs. The prospect of having high speed communication channel between an embedded project and outer world is very tempting.
