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https://macdailynews.com/2018/03/01/how-to-turn-your-ipad-or-ipod-touch-into-a-dual-sim-mobile-phone-and-have-up-to-3-active-phone-numbers-on-your-iphone/
How to turn your iPad or iPod Touch into a dual-SIM mobile phone and have up to 3 active phone numbers on your iPhone