There has been a long standing bug related to Gizmo on the Nokia Internet Tablets. Basically, the dial pad is non-functional after a call is established. This makes it useless for voicemail systems, phone support systems and sadly, a lot of VOIP related services. Note, this bug does not affect other OS implementations of Gizmo. Gizmo claims that they cannot fix this bug without proper DTMF support being implemented by Nokia. This bug has been around for a LONG time now. There is a entry in the latest Nokia roadmap that suggests they may finally get around to fixing this issue, but given Nokia's past history, I will believe it when I see it.