Strength of cell signal significantly changes

I've noticed the strength of my cell signal significantly changes, it will go from 4 to 5 bars to 1, And I'm not even moving. The reason I moved to AT&T five years ago is that I can look out my home office window and see an AT&T cell tower. I'm aware that the IOS 4.0.1 changed the algorithm on how it shows cellular strength, and in field test mode I also see the negative number changed significantly and I'm not even holding the phone with the death grip.
In the field test mode I will go from a -71 to -108, when I do the test the phone is on my desk. It’s odd that the number doesn't slowly change from -71 to a higher number, that I could understand. In just one second it will change from -71 to a -108 (five bars to one). Such a significant change in numbers so quickly when I'm virtually living next to a cell tower seems a little odd.

I noticed the same with the cell phone I was using with AT&T prior to purchasing the original iPhone over 3 years ago which was the same or similar with my original iPhone and 3G and is the same with my iPhone 4. Any problems placing or receiving calls regardless?
Copied from this link.
http://ask.metafilter.com/60227/What-do-cell-phone-reception-bars-mean
The technical term is "EC/I0" (pronounced "ee-see-over-eye-naught") and it refers to the amount of the signal which is usable. In CDMA you can have strong signal (4 bars) and lousy EC/I0 and not be able to carry a call, and you can have low signal (zero bars) and excellent EC/I0 and carry a call fine. But they can't display EC/I0 because it fluctuates wildly (it could go from zero to four bars and back to zero again in just a few seconds) and would terrify users, so they display the signal strength, which at least has the virtue of being stable, though it doesn't really mean much.
The biggest reason why the signal strength isn't very helpful for GSM is what's known as "multipath". The signal reaching you from the cell can arrive by different routes which are slightly different lengths, meaning that they're offset in time. If you've ever seen "ghosts" on a TV when using rabbit-ear antennas, you're seeing the same effect. The "ghost" is a multipath component.
The number of bars shown with my iPhone 4 while I'm in my house fluctuates between 1 to 4 bars and there is an AT&T tower not too far away, but I have no problems placing and receiving calls and no problem with dropped calls while in my house or anywhere else. I had a 30 minute phone call last week while my iPhone showed one bar of reception.
CDMA is better overall inside buildings than GSM.

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Strength of cell signal significantly changes

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