I develop for both iOS and Android, but still use a dumb phone.

- 7 days battery life. seriously, I always get a surprise when it reminds me that it does actually run on power.

- I dont know whether it can do email, facebook or twitter. The screen is so small, why would I want to try?

- Can do internet via Opera Mini if needed (its fine for reading forums).

- Never upgrades

- Cannot use it as a distraction when I should be talking to people or working.

Life Is Good, When Your Phone Is Dumb.