When not in quarantine, I spend a lot of time in Europe, especially Italy. I would be great to find an mvno who had multinational service so that I could travel with my soon to have L-5 from the U.S. to Italy.
An international prepaid SIM such as Truphone’s is a pay-per-use option (i.e. no monthly plan charge), although the data can be expensive overseas, e.g. US$0.25 per megabyte. On the other hand, incoming calls and incoming texts might be free. It works on AT&T’s network in the US and can be kept active indefinitely by simply having credit stored in your account. (I have used this one for years, but have recently started buying local prepaid SIMs instead when in Europe.) There are other providers of this type, too, but they may be more expensive to use in the US. https://www.truphone.com/us/consumer/sim/ http://www.tellinkroaming.com/
This kind of SIM usually doesn’t accommodate MMS.
Some prepaid SIMs that you acquire abroad can be extended indefinitely. You can even find a couple of prepaid SIMs from European providers like Wind-3, Orange, or Vodafone for sale on Amazon.
If you’re able to go 100% data with no regular calls or regular texts, you may find additional possibilities.
This prepaid SIM information site is updated regularly and may be a good source of info for you:
In practice, I am data only and run everything through a vpn back to a cloud server in the US that I tear down and rebuild every month. I have an Italian hotspot that I carry around which works but is inconvenient (data is cheap!).
$15 for 5 Gb is not bad for international roaming!
I bought a prepaid VodafoneUK SIM from Amazon (which will also work in the EU, allegedly with no roaming charges, even now that we’re post-Brexit). I’m planning to try that on my next trip to Italy, if I ever get the chance.