My phobias that cause me the most problems are of mobile phones and mail.

Mail I check as little as possible. causing at times rather bad bill shock
And my mobile (which practically no one has the number to) is usually flat or lost.

Obviously this is a bit of a problem in the modern world. I tell people I'm scared of having a mobile and they just don't get it - which is a bit of a problem too. I'm fine with calling them or others having them though.
Strangely my landline doesn't bother me as much. However I get sick of it at times and pull the cord or make sure its disconnected.
Like most of these things it really doesn't make any sense in the big picture - I'm fine with skype or email.
Life's weird I guess. Logic leads me to think it's some kind of social phobia but it's hard to pin down. I guess if I had the answers I'd be rich.