Gracias a todos por vuestras respuestas.
Navegando por Internet he encontrado esta pagina:
http://android.modaco.com/content-pa...eta-1/page/40
Y en ella hay un post que quizas pueda solucionar algo:
Hi all,
Recently I just bought the Nexus One phone. I tried to migrate my sms from Nokia to this new phone.
However, I couldn't copy the mmssms.db from the system folder to the sd card because I didn't root my Nexus One phone and I didn't want to root my phone.
Luckily I found an easier way to do it without the need to root the N1:
1. Install the SMS Backup and Restore from Android Market.
2. Run the application from your phone and backup your current sms.
3. Connect your android phone to your PC and transfer the backed up xml file to your PC.
4. Open up the xml file in your PC, manually transfer all the SMSes. You can either skip all the steps in this site and open the Nokia vmg file one by one to transfer. For the timestamp, go to
www.epochconverter.com to convert your timestamp to the digits.
5. After you are done, transfer the xml file back to your android phone.
6. Run the application again and choose restore SMS action.
7. Woila!!! Done!
Okay. I know this is Nokia SMSes port to Android Nexus One. But the steps are generic enough to be applied to any types of phones, as long as you can get the SMSes that you want to port out from your current phone to PC. Heck, even if you couldn't or didn't, you can still port the SMSes over by reading the SMSes on your phone and manually typing the SMSes to the xml file in step (4).
Hope this help!