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In Tanzania there are two ways to get a work visa from immigration. One is to apply before arriving. In general, immigration will not approve applications for work visa if you are already in the country on a tourist visa. The second way (which a friend of mine tried recently and surprisingly it worked) is to apply at the airport upon arrival. This means waiting to get your visa until you actually arrive in Tanzania. On the visa application at the airport there is a box to check which type of visa you are requesting. Tell the immigration official that you want to start up a business in Tanzania. I believe the cost of this visa is $250 and is good for either 6 months or a year.
Upvote:2
That's a famously bad idea.