@HarryT As I say, it's all armchair quarterbacking but then, most online discussions are so why not make this a point of discussion?
I do have a motive for bringing it up. If there's some hidden cap on 3G use or a formula for ratio of paid data (personal documents, books) to free data, it would be useful to know to avoid stepping over that line.
@duckeedoug There was a discussion here on MR a while ago in which removing the SIM card was asked about. Here it is:
https://www.mobileread.com/forums/sho....php?p=1168588
It
appears moving the K3 SIM card to another device would be in violation of the Amazon Kindle terms of use.
A fee per unit sold seems like a plausible model. WiFi only to 3G+WiFi is a $50 premium. Is a 3G modem and SIM card $50 or is there money left over to pay the wireless companies?