1. You can get your hands on a Raspberry Pi? 2. Do you really want to try and optimize for cost on sub 30 dollar items in quantities of approximately 1? 3. AD

1. You can get your hands on a Raspberry Pi? 2. Do you really want to try and optimize for cost on sub 30 dollar items in quantities of approximately 1? 3. ADH8066 GSM Modules are approximately fifty bucks. Serial port, AT commands, etc. Who knows where you can get a data carrier for reasonable cost in this country.