Ministry of Solution converted my Huawei P20 Pro from single to dual sim for 20 dollars. I had to downgrade the EMUI first, (but you can upgrade after the conversion has been done) and the process reset my phone to factory settings so I had to make sure everything was backed up. They did it remotely (they are in the US, me in the UK. I needed to buy a new sim tray (£5 from ebay). They took care of the rest. Took about 2 hours as advertised. Works just great. Very patient with someone who is not very tech savy.
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