Well it's open source so you can change it if you want. The Dev edition, which does no firmware signing and is not restricted to any carrier, can be made to do whatever you want. It's effectively a new operating system that uses a Linux kernel.. it's just not posix.
Find all the mentions of IP addresses or 'google.com' and point them to something else if your paranoid about it.
As far as the Symbian phone goes all you can do is take their word for it that it's not going to be used to spy on you in any manner.