Things is a great GTD-based piece of software for Mac and iPhone, and as you’d expect the two products can be synchronised.
However, at the moment, you can only sync between them via WiFi when they’re on the same network – which can be a pain if, for example, you want to sync somewhere there isn’t a public WiFi zone.
However, if you have Internet tethering set up on your iPhone, you can in fact do it. Simply tether your iPhone to the Mac either with USB or Bluetooth, start up both applications, and they will happily sync – no WiFi network required.

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