If I update my unlocked and jail broken iPhone 3G will it mess it up?

It's unlocked so I use my t-mobile chip so I don't want to take the unlock off at all this is my only phone and I don't have money to get it unlocked again. But I can't download any apps because my firmware is out of date. What happens if I update it? Will it just take my jail break off or both

Just so you know its called a SIM card. If you update a jailbroken/unlocked iPhone you will loose both. Depending on what versions you are updating to you could gain both back.

It will take off your jailbreak but it won't lock it after you update just jailbreak it again

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