What highend and lowend smartphone is available in the most of the 196 countries

Basically what i'am asking is the following

1 What highend phone is sold in most countries out of 196.

2 What lowend phone is sold in the most countries out of 196.

How many countries each is sold in would also be nice

Is there any phone that i could walk into a retailer store or carrier store in any county in North America, South America, Africa, Europe, Asia, or Pacific Islands and buy wihout having to import from another country. I was having a discussion about phone companies and them not supporting some countries. Please dont mention Apple because they do not sell there products in all 196 countries