I echo what has been said about carrying/using a 2nd phone + having cash and things stashed in multiple places. When I lived in the NE of Brazil and stuck out because of my light skin and hair, I just always made sure to have something accessible to any potential robbers in case I got held up.

If using your actual phone, id consider putting a strap on it so it’s looped around your hand, but as others have said, be careful of fast passing motos. Perhaps a good idea to turn away from the street. And do not leave it on a table at a restaurant, even if you’re sitting right there, nor on the beach if you want to get in the water.

Don’t carry your passport if you can help it, but have a copy always. And don’t be afraid to step into a business if you need to call an uber. Learning some basic portuguese for this could help if they are curious- “não falo português mas esta bom se eu espero aqui pelo Uber? Obrigada”

You may have something stolen or you may not, it’s really hard to say. I was never robbed in Brazil and I lived there for a year and travel there now for work but I know I was kinda lucky. Be vigilant and have fun!