Always roll up your windows when in Dar es Salaam, bag and phone snatching is very common as I once fell prey. I was in a taxi heading to Dodoma, it had heavily rained and traffic was unimaginable. I let down my window to allow fresh air in as I was scrolling through my phone only for a man to come right up and snatch my phone and disappear so fast.
I was so shocked at first before the thought of my phone being snatched registered on my mind. The taxi driver was sorry for me, rolled up the window from his end and explained that those purporting to sell items in traffic actually work in cahoots with phone snatchers. Kindly be warned and avoid using your phone when the window is down. You would rather stay still in the heat.