Similar to other readers J reports that his iPhone drops calls and is not able to get a fix on the cell network for some time although with Verizon he can in the area where he lives:

For over 6 hours today my iPhone was completely useless for either incoming or outgoing calls. Calls would be dropped after 2-3 rings, or within the first 5 seconds of pickup. AT&T “Customer Assistance” was of no help whatsoever. Time to return to Verizon - zero dropped calls in the same location over 6 years of stellar customer service and phone service! Want an iPnone? Wait 2-3 years until you can actually use it as a phone.

Also submitted through the iPhone complaint submission form.