@VasantM_2823162 In Africa, you will need add on credit on your account to pay for all usage. It will depend what country you re in as to the charge per Megabyte; it can be anything from 10p in Egypt to £5 in Zambia. Don't forget that a Gigabyte is 1024 Megabytes, so it is very expensive to roam anywhere in Africa.
If you have a reasonably modern phone, you could consider an Esim for roaming as there are many companies offering them online. They vary from a fixed amount of data over a fixed period to other that add credit to your account and charge different amounts per Gigabyte depending upon the country you are in.
