I'm currently on Project Fi and I like it quite a lot. Travelling through Europe was seamless (these were countries that Fi has an agreement with; I assume othe

I'm currently on Project Fi and I like it quite a lot. Travelling through Europe was seamless (these were countries that Fi has an agreement with; I assume otherwise I would have to purchase a local SIM, as I had had to do before Fi.) My biggest complaint is a 5-to-25 second delay between pressing the "call this" button and the line being picked up and actually dialed. Very occasionally I'll have a call that doesn't ring, but I had had this with previous providers and with greater frequency. Costs less than Straight Talk and you pay only for what data you use. I'm on WiFi most of the time so my data costs are pretty minimal.