Thanks for stating this because that is one of our struggle right now since we never really tested this phone until we saw this complaint. But still we try our very best to support our customer.

Hmm, I have the same problem too. I tested it a couples of time, if your contact number is like +17271234567 then I will get unknown. My other contact with 1(727)123-4567 then i will not get the unknown and get the correct caller ID... i think it is definately bug,

Try to change the contact add "(" or ")" or "-" sign, it dont allow for those contact with only +7271234567.

Hope Nokia i will fix it.

I had the same problem with Identification of incoming calls which displays a message of "Unknown number" even when the number was in my contacts.
Let me told you how I fixed the problem:
I went to ICE (In Costa Rica is a Government entity in charge of bring GSM and 3G services like AT&T and Verizon), and they change my old Sim Card (GSM of 2003 ) for a new one and that's it problem solved.
So if you want to fixed change your Sim Card and tell the Company which provides you the phone services that you need to activated the Identification of Incoming calls service.
It works for me I hope it will works for you too.

We have found the problem and now fix it. For those on this thread that uses N900 in VIAERO Wireless network should be able to get caller ID on their phone now. Thanks for all your patience.

Thanks.

Viaero Wireless Network Operations

Three cheers for Viaero; it's nice to see this level of involvement.

i have the same issue..... the number whether its in my contact list or not does not show the caller id..... i live in nepal where there is still a monopoly in telecom services therefore they will not fix it even if i tell them...
someone plz give me some solution.....cant maemo fix this in their next update?

I got the new razr in December. I had the same problems. I had my numbers transfered from my old phone by the ids didn't work. I retyped all the names and numbers ( make sure that the area codes are all in there, thatmakes a difference too)
and the caller id worked.

Maemo should be able to fix it too if they would just allow the mobile to just accept the caller ID regardless of the numbering plan ID that comes with the signalling message. What happened is that, maemo ONLY understand if it is E.164 format. All other phones seems to understand whatever format the caller ID uses but for some reason Maemo ONLY wants the E.164 format.

Thanks.

I live in Estonia. I am facing the same problem. Any ideas of how to get rid of the "unknown numbers" calling?

Before everything worked perfectly... until some time. I just don't know what to do. It it really annoying.

Is it a bug? or some application maybe? List all the possibilities...

Thanks in advance