I assume I can use my own SIM (UK) in the Boron: GSM version, but I’m a little confused about the Particle Cloud costs for the Boron (Yep I pay my own data costs from the SIM provider), is the cost of using the Cloud free for the first ten units or is there an additional ongoing monthly or data usage cost?
Yes, a 3rd-party SIM card can be used in the Boron. You can have up to 100 Electron or Boron devices with 3rd-party SIM cards in a developer account with no monthly device cloud charges. You only need to pay your mobile provider. You can still use all of the Particle cloud features with these devices.
Brilliant! Thanks very much for your ultra swift reply.