- top level: Android WebKit, Safari, Opera Mobile
- mid level: S60 WebKit, Blackberry, Opera Mini
- bottom level: NetFront, IE Mobile
When it comes to flaky connections, PPK points out that your connection speed is affected by the activity of the people around you. It's unlikely that this is going to change any time soon, so it's important to reduce the size of your downloads as much as possible. The problem is that caching on mobile devices isn't always reliable.