In letters sent late Friday to the two companies and AT&T Inc., the FCC asked why Apple rejected the Google Voice application for the iPhone and removed related applications from its App Store. The letter also seeks information on how AT&T, the exclusive U.S. iPhone carrier, was consulted in the decision, if at all.

The FCC's letter to Google asks for a description of the Google Voice application and whether Apple has approved any other Google applications for its store. Google Voice assigns a single phone number to a user's cellphone, land line or Internet phone accounts. It also allows free text messaging and inexpensive international calls.

On Tuesday, Google said Apple wouldn't let it distribute the software through its App Store, where iPhone users can download software. Apple has previously turned away Internet-telephony programs because they repeated key iPhone functions. In a statement Friday, FCC Chairman Julius Genachowski said the FCC "has a mission to foster a competitive wireless marketplace, protect and empower consumers, and promote innovation and investment." The inquiry letters "reflect the Commission's proactive approach to getting the facts and data necessary to make the best policy decisions." The inquiry isn't a formal investigation, but it is notable because the FCC hadn't received a complaint about Apple's rejection of Google Voice.

"Apple did not approve the Google Voice application we submitted six weeks ago to the Apple App Store," Google said in a statement. "We will continue to work to bring our services to iPhone users, for example by taking advantage of advances in mobile browsers. We will supply the information that the Commission has requested."

What finally put me over the edge? It wasn't the routinely dropped calls, something you can only truly understand once you have owned an iPhone (and which drove my friend Om Malik to bail). I've lived with that for two years. It's not the lack of AT&T coverage at home. I've lived with that for two years, too. It certainly isn't the lack of a physical keyboard, that has never bothered me. No, what finally put me over the edge is the Google Voice debacle.

Most of you won't know what I'm talking about, so I'll explain. Google Voice is a call management service that lets you determine what calls get through to you based on who's calling and what time of day it is, among other factors. It has amazing features, like automatically transcribing all your voicemails. And you can forward calls to any other phone easily and automatically. Here's an overview of the service if you aren't familiar with it.

I've always wanted to use Google Voice but there's a big switching cost - changing your phone number. Too many people have that phone number and use it to call in great stories. There's no way I'm giving that up. And there's another problem with Google Voice. When you make outbound calls from a phone, it (obviously) doesn't use your Google Voice phone number, so recipients don't know it's you calling. Those were two hurdles I wasn't willing to jump over. But now Google is planning on rolling out number portability, so I can move my mobile phone number to Google. None of my friends, family or contacts have to store a new number.

That still leaves the problem of outbound calls, though. I can move my mobile number to Google and then get a new iPhone account, but outbound calls won't be identified because they are on the new number. Google has a solution for that too, though. They are releasing apps for a variety of handsets that effectively take over the native dialer, address book and call log. Problem solved. I can use any phone I like, or a bunch of phones, and just choose the one that makes sense at any time. I never have to be tied to a carrier and their restrictive contracts again.

Or so I thought. Apple and AT&T are now blocking the iPhone version of the Google Voice app. Why? Because they absolutely don't want people doing exactly what I'm doing - moving their phone number to Google and using the carrier as a dumb pipe. So I have to choose between the iPhone and Google Voice. It's not an easy decision. Except, it sort of is. Google isn't forcing the decision on me, Apple and AT&T are. So I choose to work with the company that isn't forcing me to do things their way. And in this case, that's Google.