Okay. If you're using multiple SIMs that are small, I would suggest a
container system to prevent losing them.
As their density increases, is it logical to expect you to use fewer of
them, change them out less often?
I have a multi-SIM--a card that holds data for more than one network. It
doesn't work very well. I have it because it came free with a SIM card
reader/cloner that I got to back up the SIM card [all data, including
network info, not just the addresses and photos that can be transferred
via Bluetooth.
An improved version that's more reliable can replace the need to switch
physical SIM cards, but the software needs a lot of work. Also, you
still have to remove the card to clone a new SIM, using a computer--not
easy to do while traveling. If you could do this wirelessly on an
encrypted network at the provider's shop or simply from a local tower,
then SIM card size won't matter.
Container system - what happens when I drop my card between the
floorboards of the convenience store when I buy the second card, before
I can get it into a container? After all, my hands are full of greasy
munchies and drinks, and I'm in a hurry to catch a train. The smaller
the card, the more likely it is to be lost before putting it into a
container. OK, I'm more careful than that. I've left the card in my
phone under the battery, but not in the slot when using another card,
but I have to be careful that it doesn't drop when I pop out the battery
to change cards.
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