If you haven't already, now's the time to ditch airtime for cell-to-cell calls.
and our own cursory call studies, a typical WhatsApp call without video uses 0.5MB and 0.75MB per minute. The amount of data you use may vary depending on call quality and signal strength and if one or both parties are connected using different data speeds. There's also a low data setting on WhatsApp that may reduce both call quality and data usage, though they don't specify by how much.
For this study, Business Insider assumed a likely worst-case scenario where a WhatsApp voice call uses an average of 0.75MB per minute. Using this as a yard stick, a WhatsApp call shouldn't cost more than 6c per minute, depending on the service provider and data bundle size.This means you'll save between 62 and 75 cents per minute - or as much as 96.45% - if you use WhatsApp over airtime. Although in rand value this isn't dramatic, talk for longer and it can have a reasonable impact.
Quite how much you save in percentage terms varies according to the cost of airtime and data at mobile service providers. But customers at MTN, which currently has the highest per-minute airtime rate, stand to gain the most by switching to WhatsApp calls - with a price difference of up to 96.45% depending on the specific data bundle.
Here's how the cost of a WhatsApp call compares to those using airtime, assuming you use an average of 0.75MB per minute:
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