If you’re going to build a startup, you have a better chance of success if you have a proven track record. Uberconference CEO Craig Walker has such a history as the founder of GrandCentral (which became Google Voice) and Dialpad before that (which became Yahoo Voice). Unlike most conference call services, there is no pin required from Uberconference which uses the dialing number as the authentication. Anyone who has tried to join a conference call while switching back to email on their phone to get the PIN can appreciate this feature. Another nice feature is the rude background noise attendee…