I received a Handspring Treo 600 from Orange in the UK.

This was unlocked by Orange UK, so I could use elsewhere.

I have an account with Orange Israel.

When I put the Orange Israel sim card in, the phone works perfectly though I am unable to get a call through to Orange Israel answerphone (*151) or Customer Services (*111) or any other dedicated Orange Israel service.

I have tested the sim card in my Sony Ericsson T68I and the above works perfectly.

Any ideas what this might be !?!?