A problem for some is that you supposedly need wifi to sync the GTD app Things on your iPhone with your computer. To make matters worse, some work environments (such as my own), split devices unto different subnets on their LAN, making it impossible to sync Things. There are (at least) two solutions to this problem:
- You set up a peer-to-peer network between your Mac and iPhone. This is a bit cumbersome and you lose your WLAN connection to boot.
- The other solution, which I found by chance, is setting up your iPhone to share the internet connection and connect your Mac to it using either USB or Bluetooth. This creates a network connection between the two and you can now sync the two without messing with your other internet settings.