Dropped Calls with 2 Bars of Signal??

[HKUSP.40]

Anyone know how I could manage to drop 3 calls in a row (within 5-10 minutes of each other) all the while my iPhone 4S showed that I had 2 bars of signal?

 

[stockscalper]

You must be on Verizon. Happens to me all the time - I'll show two to three bars and drop calls like crazy.

 

[HKUSP.40]

You must be on Verizon. Happens to me all the time - I'll show two to three bars and drop calls like crazy.

Yep, I am on Verizon. Weird...