Follow ZDNET: Add us as a preferred source on Google. A few years ago, I had a vision of never needing a mobile hotspot again. After all, my iPhone — a gadget that’s never more than an arm’s length away — has that feature, and connecting to it is a doddle if all your devices have the Apple logo. But it’s a poor experience. Try as I might, the connection is almost always unstable and slow (especially when streaming or connecting to a remote system). It’s a ma...