Travel

SIM cards

Google Fi

If living in, or traveling to the US, Google Fi is the best option.

It's a virtual network operator, that multiple networks both in the US and abroad. It supports 5G and Wi-Fi for calls and texts (across many countries).

The USD $65/month Unlimited(-ish, since after 50GB the speed is too low, making the plan unusable) is the only one that's convenvenient for international travel and includes unlimited data-only SIMs.

One can pause the plan in 3 months increments, in real time, using the Fi app. Resuming might take a few minutes, longer if outside the US. Charges are prorated. Comes with freebies like Google One and extended YouTube Premium trial.

Supports both SIMs and eSIMs. I recommended to use eSIM for main line (so you can keep your primary SIM in). Data-only devices will need a physical SIM (free 1-week delivery to US addresses).

Can be ordered with any credit card (debit cards are not accepted) that accepts a US billing address. eSIM activation is done via the Fi app in a few minutes.

Keepgo

Great cost-per-GB data-only SIMs for Europe, especially if not using Fi already.

Good backup data plan if using Fi.

To get a good price per GB ($2-3) use a refferal link to sign up. Apply GOREFDATA coupon for your intial refill of 1GB+.

Refill your line with at least $3 once a year, and your balance will never expire. Some coupons will work only for (initial) refills of 1GB+.

Delete and create a new account instead of refilling if using this as a backup plan, and you have <1GB left or if your balance expired.