You don't need a full fledged 4G chip for NB-IoT - something like Quectel BC66 would work. Its ~€10/each for QTY250 [0], or €29 for QTY1 on a Arduino compatible

You don't need a full fledged 4G chip for NB-IoT - something like Quectel BC66 would work. Its ~€10/each for QTY250 [0], or €29 for QTY1 on a Arduino compatible dev board [1]. Ublox has a similar product for a similar price [2]. [0] https://www.avnet.com/shop/emea/products/quectel-wireless-solutions/bc66nb-04-std-3074457345635728059 https://www.avnet.com/shop/emea/products/quectel-wireless-so... [1] https://www.tekmodul.de/produkt/bc66-dvk/ https://www.tekmodul.de/produkt/bc66-dvk/ [2] https://www.u-blox.com/en/product/sara-r4-series https://www.u-blox.com/en/product/sara-r4-series