Alright, someone who reads this site either knows the answer to this question, or knows someone who knows the answer:
Why are there no prepaid cell phone SIMs/cards that do not have an expiration date? Or, at least, a yearly expiration date, rather than the longest I ever found, which was 90 days?
Or, to put it another way, how does the lease between these prepaid mobile virtual network operators and their host infrastructure providers work? Is there some yearly maintenance fee for each number, or each SIM card, or both?
Yes, I am going somewhere with all this, though definitely not in the near future… lots of details to work out.