iPhone SIM cards for visitors to Ghana (Accra)

Hello! I will be in Ghana for 1 month, and have a question about cell phone usage with my iPhone. I would like to use my current phone with a local plan that economically allows for phone, text, and internet usage without having to sign a contract. I suppose I would have to buy a local SIM card that has a packaged plan for temporary use. Can anyone recommend a carrier or plan? Thanks!