Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
My phone was working marvelously until the carrier update came through on my iPhone.
Afterwards I was dropping calls in areas where it worked perfectly before.
I dialed *228 option 2 in attempt to resolve the problem and miraculously it worked.
Since then my iPhone has been great.
Your mileage will vary if course.


[delivered by an iPhone]
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.