"Note that having an invalid phone number (this one is obviously invalid) can get you (and us) in trouble.... you should correct this."
If I didn't have a cell phone (and I didn't for a long time) I would never even think of putting a real phone number down. And I also would never use my real street address.
I do use my real name and an email address that never changes and I check regularly.
I have many domains over many years and I've never had a problem. I doubt I ever will.
With cases of domain stealing on the rise, I'd say much more important is picking a secure company to register your domains with. Mine are locked and can only be unlocked by me, and I would be notified of the change at my email address.
Regardless, I'd rather be safe than sorry, regardless of what internic says. I myself have never heard of anyone losing a domain because they didn't use a real phone number, as long as they had someway to be contacted. IMHO the threat borders on paranoia.