It's already been replaced, a long long time ago.
With Contract sim cards that get billed at the end of the month.
There's also limit caps where you tell your Service provider you want maybe 30 minutes talk time a month, and also maybe 1Gig data.
Zim is just backwards. Countries like USA dont use recharge cards much. When you buy a sim card, you pay say $20 a month for Regulated talk time, Unlimited data and unlimited texts.
The minister Super Mandiwanzira is a good man. He just wants to take us forward in time.