As I’m new to all this and developing a project that hopefully may be useful to my local lifeboat station, I may not always get to use it constantly so was wondering, after activating the SIM does the SIM expire after a period of not being used?
The SIM will stay active as long as you pay the baseline connectivity fee (see pricing details here). If your account does not have a credit card on file or your account goes negative, then your SIM will be deactivated. You also may pause your account, as noted in our FAQ.