Which SIM card shall I choose?

The main criteria of choosing the suitable SIM card for your Pawfit tracker is cost and 2G phone network coverage. Please visit the candidate cellular operator’s website to check the coverage in your area. Once you are satisfied with the2G network coverage, then select a tariff which covers a monthly data (GPRS, 2G data) usage of 100 MB (Megabytes). Call minutes or texts are not required.
For UK customers:
Vodafone PAYG SIM (Big Value Bundle package or classic PAYG 1) EE PAYG SIM (Multi Sim package)
O2 PAYG SIM (Big Bundle package or classic PAYG)
Tesco PAYG SIM (Rocket packs or Triple Credit)
Please note SIM cards for mobile broadband, WiFi and tablets are not supported.