The Sigfox castellated breakout board is the great solution for your IoT project you can put on a breadboard with headers or solder it surface mount on your designs with the provided Eagle library.

It communicates over UART and It is very easy to use. Simple serial commands to fill the buffer are used.

This is a 3.3V system, do not power It with 5V.

The Wisol transceiver module is very popular and easy to use, you will not need to worry about any configurations or complicated setups like other technologies. Simply send the serial command with the data and it will be sent over the air.

The connection is a u.Fl Connector so you will need a cable and antenna that you can add to your order The antenna you need to use is a 915 Mhz.

This Module is ZONE 2 and it will only work in Canada, Mexico, United States and Brazil This does not include the arduino shield you can add it as an option

You don't know what sigfox is?

Check out this webpage explaining what it is

Where can I find sigfox network ? Check the map

This is the pinout diagram.