Global Multi-Country SIM Card | Global Orange Internet + Calling eSIM
I used this eSIM card in Croatia, Montenegro, Slovenia, Hungary, and Austria. The reception was excellent 90% of the time, and the phone function was very convenient. The reception was only slightly poor in mountainous areas or when traveling on trains in remote regions. I initially chose the global SIM card because I was going to Montenegro. If the countries you're visiting are all within the eSIM card's coverage area, you can buy the eSIM card.
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