Anyone familiar with debranding cell phones?

I just bought a sony ericsson k790a (upgraded from the SE k750i) and found my provider (rogers) has blocked me from using MP3's as ringtones because they want their users to download and use their ringtones(i guess). 

I've been searching the net and found many people were having the same problem, and some have said debranding the phone is the way to go, and other have said just convert my mp3's to DRM and copy them to my phone. 

I'm probably just going to try converting them to DRM first, but I'm kinda thinking about debranding my phone because apparently it unleashes the full potential of my phone. 

Have any of you tried debranding? Is it worth it and was it that hard to do?

Lippsman,  I will probably be using a software hack.

https://www.wotanserver.com/en/supported-phones/sonyericsson-k790-debranding/

I've already bought some credits for this site, I just need to download the software and giver a go.  I'm just a bit nervous as I haven't really ever heard of de-branding a phone until yesterday.

Haven't used a soldering iron since shop class in grade 7.  No way I could attempt a hardware flash.

Risky, I finally unlocked my phone last night and it's working better than ever now!  No more of that Rogers bullshit..  I've got my own mp3 ringtones for days and I even have a bunch of new games that came with the new firmware, and more. 

I'd definetly recommend un-branding your phone with the wotenserver app if you currently have a branded phone.  I'm still finding new features that I didn't have before.