I just returned from Japan, where I gave WorldSIM one last chance. There was one network that I could occasionally get WorldSIM to work with. I had no service in Yokohama or Tokyo. My wife has Google Fi, and it worked flawlessly everywhere we went. This was a bit better than past experiences in Israel, Tanzania and Caribbean locations where WorldSIM was useless, no coverage at all, though their website claims otherwise. I’ve spent many hours of vacation time trying to get WorldSIM to work. Only in parts of Europe and the United States has it been somewhat dependable. It’s extremely brittle, unpredictable, and will stop working for no apparent reason. It’s definitely not something you want to rely on if you truly need cellular service, or value your time. Other issues I’ve had include inconsistency between information on their web site, printed instructions, and customer service responses. I’ve been charged for calls I did not answer, or when incoming calls were supposed to be free, and for using data when WorldSIM wasn’t working at all. It will switch from a preferred operator and nail you with predatory charges. I was charged $24.90 and $10.25 for data sessions of 1.658 Mb and 0.6 Mb. I was refused refunds/credit when WorldSIM did not perform properly, and received frustrating customer service responses that ignored my questions and/or claimed things that were not true. I’m fairly astute when it comes to technology, but after more than 7 years of frustrations, using at least 4 different phones, I give up! I am baffled by all the positive reviews. I hope this one will help someone make a better choice than I did.