Will a phone bought in US work in South Africa South Africa uses small sim-cards that insert into the the phone and i heard that the USA doesn't have sim-cards that are removable?

Yes, a phone bought in the US can work in South Africa, provided it is unlocked and compatible with the GSM network used there. While many US phones do use removable SIM cards, some models, particularly older ones, may not be compatible with international networks. To ensure functionality, check the phone's specifications for GSM compatibility and confirm that it's unlocked from the US carrier. If it meets these criteria, you can simply insert a South African SIM card and use it.