Is it a good idea to update my iphone 4?

I currently have an iphone 4 ios 5.1 modem firmware 04.12.01 and if i update to 5.1.1 will the modem firmware change to 04.12.02? And is there an unlock for 5.1.1 04.12.02 or 5.1 04.12.01? I do want to unlock it to tmobile and if there's a good solution let me know

Update. Only 1.59.00 can be unlocked and your already way past that baseband.
if you need an unlocked iphone, email me i have a few

No stay on the current firmware, you can't unlock it if update.

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