[otachack]

I think you also need the dev account if you want to run apps on a physical phone, but it's been awhile since I tried.

[jeffreyrogers]

You can just use your Apple ID (I think that's what it's called), which is free. Some of the features are only available if you have the $99/year account.

[steve_taylor]

You can side-load builds onto your iPhone/iPad and they expire after a while (maybe 30 days).

[saagarjha]

7 days.