if you mean removing a carrier lock, yes I did that. Totally hassle free, it was locked to vodafone germany. I registered the device online, and minutes later any SIM I popped in woked fine
If I understand correctly, your phone was locked to Vodafone Germany from the very start. Then, some time later you registered your phone on a website, and this action alone freed your phone.
One question : whose website did you register your phone on ?
eg. Phone maker ? Phone seller ? Provider of the SIM card ? other ?
It was the service providers' website, vodafone. They had the option to remove the carrier lock for free because the phone was older than 4 years or so.