I tried Maya mobile while in Greece, using their unlimited 5-day plan, and so far, it works great in Athens and Evia island. I wanted to extend it for another 30 days but accidentally selected 2 plans for the same time, which cost me 118$ instead of 59. I reached out to customer support through their chat on the website, and they replied in just a few seconds. In under a minute, they refunded the extra charge, great customer service. Plus, like I mentioned, the esim works really well.