There are no IDEN networks to roam with in Europe. Nothing to lock on to.
You can roam in USA, Brazil, Chile, Peru, Mexico, and Argentina.
All other countries on this planet will give no service.
There are some models of IDEN phones that also have a GSM radio for roaming but not the blackberry 8350i.
Pick up a cheap prepaid phone if you need a temporary "burner" phone.