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Please Don’t Make Me Download Another App | Our phones are being overrun
(www.theatlantic.com)
This is a most excellent place for technology news and articles.
Huh. Doesn't happen often I guess but typically when I'm asked for a phone number or email I refuse or say I don't have one and it really throws people off and they usually refuse to complete the form or do whatever the hell it was they were doing.
Might vary by locale? Around here (South US) it seems like every single store has their own rewards/discount/whatever system that requires your phone number but it's not necessary for the transaction... It's just an extra info grab.
Sometimes the user facing POS/credit card reader will let you handle it (enter/skip) but many places rely on the salesperson to ask and then enter it or skip.
But, I also don't get around much so my experience is limited.