Yes, walkie talkies in other countries usually work — the legal side is where it gets messy.
Let’s separate two questions. Does the radio physically work abroad? Usually yes. Most consumer sets use license-free bands in the country where you bought them. But the thing is, radio bands by country are different, and what’s license-free in one place can be illegal in another. France is stricter than the US. Japan has its own channel plan. Some countries don’t allow any of it without a license, period.
To be fair, for a family trip to Europe with standard gear, you’ll almost certainly never have a problem. Customs won’t stop you. Nobody’s scanning for your tourist radio. But “almost certainly” is doing a lot of work there.
For international radio use in a business context — say you run events or a crew that crosses borders — check the local rules before you rely on it. The honest answer: it depends on the country, the frequencies, and the power output. If you need one tool that works everywhere, look at Zello-compatible POC radios, because cellular data covers far more places than open radio bands do.
Our contact us page gets a lot of questions like this, and honestly we don’t keep a list of every country’s rules. Nobody holds that in their head. Check before you fly.