I had the same problem and kept getting the standard "get a mobile phone" response from PayPal. When I challenged this earlier today (and used the word "Discrimination") I got a very helpful response which said that, if you have no mobile phone or poor reception PayPal will happily send an automated message with the one time use code to your landline. All you have to do is select the "HAVE US CONTACT YOU" option which should appear on the authentication screen. As I only got this info today I haven't had the opportunity to try it however it looks like there is hope for us out there.
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