Review on Raspberry Pi GSM/GPRS/GNSS Bluetooth HAT Expansion Board SIM868 with GPS Module for Raspberry Pi 2B 3B 3B+ 4B Zero Zero W – Make Calls, Send Messages, and Transfer Data by Jessica Russell

In the US. T-Mobile 3 for 30 prepaid SIM cards ($3 for 30 minutes/texts per month, not 30 of both). Launched on Mac in minutes before playing with Pi. Use CoolTerm to review the messages and get the CSCA number (just type at+csca? and it will pop up). I've been waiting all day to rip out what's left of my hair. I think my biggest struggle was with the silly little adapters to make it a full size simulator. Now that it does what I got it for, it's time to play with the rest. (Only 4 stars because I haven't played with the other features.)