Apologies if this subject has already been addressed, but I'm looking to send and receive text messages, ideally from an Arduino UNO R3, with a GSM module or similar and it seems as if only 2G modules are available at a reasonable price, and 2G is mostly no longer operating in the UK.
I'd consider a WiFi approach, sending and receiving WhatsApp messages - with an WiFi enabled Arduino type processor if that's an option. Essentially, I'm hoping for something inexpensive and simple to set up.
Any suggestions?