Random User-Agent has failed in many ways but User-Agent Switcher and Manager has great chances to succeed. But even User-Agent Switcher and Manager has issues. Like if you select edge browser and go to OS to select like Linux, you will it doesnt exist apart from windows, mac or windows phone. OS X Mountain Lion; Mac OS X v10.7 Lion; Mac OS X v10.6 Snow Leopard; Mac OS X v10.5 Leopard; Mac OS X v10.4 Tiger; Mac OS X v10.3 and earlier; Mac OS X Technologies; Classic Mac OS (OS9, OS8 & System 7) Photos for Mac; QuickTime; Safari; Front Row. 1) open facetime. 2) open preferences. 3) uncheck the box 'iphone cellular calls'. 4) recheck the box 'iphone cellular calls'. 5) close preferences. Somehow, the number in that cellular calls box had gotten attached to a different number on my account. Hopefully this works for you as well.
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