Yes ... I work for Twilio as an IoT SE - there are a lot of great and inexpensive modules that you can use. Stay away from anything 2G/3G as they are being shut down as bands are being reallocated. Also, avoid the "quad band" solutions that are advertised.
I usually buy SIMCom modules from Ali Express. The SIM7000A or G, SIM7070G. The A is usually North American bands, and the G is global bands. There are E versions for Europe. These are CAT-M1 and NB-IoT modules, and I usually use the CAT-M.
NB-IoT is a great idea, but depending on where in the world you are it might not exist. Also, Super SIM does not currently support NB-IoT. We have a different T-Mobile SIM for that. If you really want to go NB-IoT, then the SIM7020{x} is a good module to develop with, or the Quectel BC66.
There are also some great projects now running code directly on the cellular modules. Search github for Wiz-IO. Georgi is brilliant in what he's doing, and supports numerous languages running directly on the Quectel modules.
Yes ... the website is a "work in progress" and we just got our second round of PCBs that we are testing. We're pushing to get the kits up there in the next couple of weeks.
Nice prototyping board! We've been working on a similar concept at ESProto - http://www.esproto.com/ - and have taken a few steps beyond your board. We've created the ESProto 1, and now the ESProto IoT. Both are being released as open source, and also sold as kits.
The ESProto 1 is designed to support the AI Thinker ESP-12F (FCC Certified) module, and give you space for an optional regulator, and prototyping space on board. We include jumpers and a push button for easily entering programming mode.
The ESProto IoT is our newest prototyping board, and couples the ESP-12F with a 5v Arduino Pro Mini to provide enhanced connectivity for sensors and peripherals, all in the form factor of the Arduino Uno.
I usually buy SIMCom modules from Ali Express. The SIM7000A or G, SIM7070G. The A is usually North American bands, and the G is global bands. There are E versions for Europe. These are CAT-M1 and NB-IoT modules, and I usually use the CAT-M.
NB-IoT is a great idea, but depending on where in the world you are it might not exist. Also, Super SIM does not currently support NB-IoT. We have a different T-Mobile SIM for that. If you really want to go NB-IoT, then the SIM7020{x} is a good module to develop with, or the Quectel BC66.
There are also some great projects now running code directly on the cellular modules. Search github for Wiz-IO. Georgi is brilliant in what he's doing, and supports numerous languages running directly on the Quectel modules.