I personally use Google Fi when I travel internationally. Their Flexible Plan is just $20/month for unlimited talk and text (plus taxes/fees).
Seamless International Coverage: It automatically works in over 200 countries with zero hassle. As soon as I land, my phone just connects.
No Hidden Roaming Fees: Texting is free worldwide. Data costs the exact same abroad as it does at home ($10/GB), so you only pay for what you actually use.
Affordable Calls: Cellular network calls are about $0.20/min while traveling (great for quick emergencies). I usually use WhatsApp for free voice calls.
Free Smartwatch Connectivity: Unlike other carriers that charge extra, Google Fi includes full connectivity for compatible watches (like the Pixel Watch) at no extra cost. This is a huge safety feature - even if my phone dies, I can still make calls from my watch.
Hardware Deals: Google often runs aggressive hardware promotions. At the moment, they are offering significant discounts (up to $800) on the latest Pixel devices for new subscribers who stay for 2 years.
*Unlimited talk: for calls made within the US (and sometimes Canada/Mexico depending on your plan). International roaming rates apply for cellular calls abroad. Please refer to Google Fi terms of service for full details.