[Q] Q:A ROM updapte will affect operator's config?

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Waddup =D!
im a novice with this "smartphone fever". i had a nokia 7500 for 4 years so... ya know XD.

Im posting this, cuz i really want to update my rom version. I've been reading the threads on several foruums 'bout this topic, but i didn't find any answer. So, i fear to lose the operator's services, o sim incompatibility if the update go wrong.
There isn't any posible legal or official update cuz in this hellhole country (venezuela) the technology & updates on this devices are very few, (most are in blackberry platforms). I know there's an update to WM6.5 in some countries, but here is not the case. so, chaging my rom version will affect the operator configuration o the sim configuration?

Sorry if there's any phrase written in Indian english, my englis is not so correct :P.

Thnx for tha help.

Other thing, someone know 'bout a QR code reader for snap? i've googled serching one but it was useless :S'
thnx for tha help :P
See ya