I recently purchased the ATT version of the Treo 600. I have activated my unit and love it. However, I have noticed that I do not get a lot of calls. This evening I got a call on my land line asking me why I am not picking up my mobile. When I picked up the Treo there was no indications as to any incoming calls.

I then made a call to Voicemail and then the unit suddenly came alive and showed me all the missed calls and messages over the last couple of hours.

Does the TREO have some sort of sleep mode that I am not aware of ?? Or, do I have a faulty unit ??

Any ideas anyone ??