Where to buy I phone 12 pro

See: Apple (Qatar) - Where to Buy

Apple's Qatar store tells you straight out you need to visit a Vodafone, Qatar dealer to purchase an iPhone. Here's their order page:

https://www.vodafone.qa/en/shop/devices?filter-producttype=HANDSET&page=1&pageSize=9&sort=RELEASE_DATE-DESC

https://www.apple.com/qa/

Note the URL ends in qa, noting it's Apple's site for Qatar.