This just started, I clear my browsing history (Google/Firefox) and then GMail will not let me log in. I get a message saying it does not recognize me, and I need to give a phone number for an unlock code, which only works till I delete browser history again. I have been doing this literally for years and need to clear browser history frequently in order to access certain sites. I do not have a phone that texts so this is doubly a problem and have borrowed a phone number to temporarily use. Any thoughts?