Let me start by saying, if you're planning a European adventure, this SIM card can be a lifesaver. I used it during my recent trip across Portugal, Spain, and France, and overall, it worked like a charm. The activation process was straightforward - just follow the instructions on the mewfi website. Pro tip: do this at least 2 days before your trip to avoid any last-minute stress.

The data allowance (6GB in Europe/10GB in UK) was sufficient for my 3-week trip. I used it extensively for Google Maps, Instagram updates, and occasional restaurant searches. The coverage was excellent in most areas - Lisbon, Madrid, and Strasbourg had perfect connectivity. However, like one reviewer mentioned, I did experience brief data drops in Barcelona.

Now for the not-so-great parts: calling functionality was hit or miss. While I could make local calls in Portugal without issues, some attempts to call Airbnb hosts failed. Also worth noting - this is technically a UK SIM being resold, which might explain some limitations. As another user pointed out, Three's official policy states these are meant for UK-based use.

The hotspot feature worked surprisingly well (despite warnings not to use it), allowing me to connect my tablet simultaneously. But beware - there's apparently a hidden 12GB roaming limit that isn't clearly advertised, which could leave you stranded if you're a heavy data user.

Final verdict? For short European trips where you mainly need data navigation and basic connectivity, this SIM delivers good value. Just manage your expectations regarding calling reliability and be prepared for possible coverage gaps in certain areas.