It's a great point about habits. It probably took me a surprisingly long time before it became second nature to make a note on my phone (or more likely just take a picture) to remember something rather than make a note on a piece of paper. And I still sometimes find myself carrying around paper or plastic cards or copies of information that really aren't critical and could just as easily be a photo on my phone.

I suppose there's a downside to everything being dependent on your phone but for non-critical stuff, it makes sense.

And it takes time to get comfortable. I gave up my landline fairly recently after deliberately avoiding using it at all for about 6 months--well, except once when Internet failed. But I finally decided that, while it can be somewhat higher quality and was something of a backup (though it was still from the cable co), it just wasn't worth $40/month as a backup.

ADDED:

>you'll find lots of forms that ask about landline vs cell, or assume landline is the primary phone number, etc.

This is one of my minor annoyances about giving up my landline. I really don't like giving out my cellphone number at random. For work stuff, I just give out my office number which doesn't even have a phone attached :-) But there is some personal stuff where I don't necessarily want to give out an entirely fake number but I don't want them calling my cell either.