I travel a lot and in many countries a prepaid SIM (which will expire after as little as a month without use or top-up) is the cheapest way to go. Most countri

I travel a lot and in many countries a prepaid SIM (which will expire after as little as a month without use or top-up) is the cheapest way to go. Most countries are moving towards requiring identification before activating a SIM card, like you say. For example in Vietnam, this has only become a thing in the past month or so and it is not enforced in practice in many unaffiliated corner stores. Last month, I just walked into a corner store paid a couple of bucks to get a preactivated SIM card with a couple of GB in two minutes.