AutoUpdate RAZR out of mainstream ServiceProviders

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http://forum.xda-developers.com – I bought my unlocked phone on Amazon. When I receive it I check IMEI and found that it is for Germany(with Vodafone fw). Actually I'm not in germany and is not using vodafone. i'm in russia and using MTS. So my question is: how do I get received updates for my RAZR ? For now I install EU Retail version of ICS and it is good. But I prefer do not install updates manually. If someone can/know, please describe how update mechanism works. And why my WiFi connection is not enough to receive OTA(for example) updates. (HowTos)