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So long, small phones
(www.theverge.com)
This is a most excellent place for technology news and articles.
Yes, that is the kind of use case I'm talking about. Rather than beefing up a thousand dollar phone with a case and a holster, I'd rather keep the good phone somewhere safe while I take a far cheaper handset in my pocket.
Right now, the way I could have that is to have 2 lines with different phone numbers and different phone plans, so the monthly cost doesn't work out.