Generally every quarter new cells come out. So you gotta figure about every 3-4 months. How much are you looking to pay for a cell phone? What providers are in your area? I just got a new phone, and love mine. Honestly, you can get better deals on-line than if you went to a local store. Recently I got a Sony Ericsson T637 through AT&T Wireless for almost nothing, but if I woulda bought it at a local store it woulda cost $199 + tax.
Also, what kind of phone do you want? A flip phone or not? Personally, I hate flippers. They look like stupid ass clamshells.
This is the phone I bought, and it's really tiny:
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