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Am I right that if I use my iPhone (which I have not yet bought) to make a WhatsApp to WhatsApp call then the position is as follows?

  • If I am using wifi, this activity does not incur charges (because whatever is done through wifi does not count as either "data" or "minutes"?), but

  • if I am using the cellphone network, this activity will count under "mobile data" or "data allowance" (or perhaps "minutes"?), and therefore it will incur charges, being paid for out of either "data" or "minutes" or perhaps both?

Please assume that I have a PAYG arrangement that allows a specified amount of "data" and number of "minutes".

I have not used a smartphone before, and although I have read a few pages the exact meaning of "data" and "minutes" as these terms are currently used remains somewhat opaque to me. Thus "minutes" seems to refer only to voice calls placed to a phone number through the cellphone network. But if the call is made from WhatsApp to WhatsApp then it is still a voice call (and also a video call) made to a phone number, even it obviously goes through the internet (and requires a continuing transfer of digital data). As for the actual connection required for a WhatsApp call, it may be made through wifi or it may be made through the cellphone network. If it goes through the cellphone network, does that make it count as "data" rather than "minutes". As I understand it, even a short video can amount to a lot of data.

Where is it documented what is considered data on iPhone for cellular carriers?

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Usually carriers distinguish

  • minutes: for voice calls using the standard phone app, to either other phones or landlines (which can be confusing since FaceTime calls and audio use data and not voice minutes)
  • sms (which can be confusing since the the message app uses data for iMessage and SMS for MMS and SMS)
  • data: for all other internet traffic generated by any app that doesn’t hand off to SMS or the phone app.

WhatsApp uses data for both messages and calls. If you are in a mobile network, any activity you do in that app counts towards your data usage. If you are logged in to a WiFi network, data will be send/received over WiFi.

Contact your carrier for details how you ar set up so you can reconcile your bill and plan with how data usage on iOS records usage.

  • Thanks - very clear. I think I've understood this now. This is assuming the flow diagram as given in my comment to @ankiiiiiii's answer doesn't fall down somehow. – ool Aug 12 at 14:17
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Mobile carriers provide two basic services: mobile voice service and data transmission. Mobile voice service is provided by a wireless connection to the carriers towers, and supported by the Mobile Switched Network on the carrier side, that connects to the Public Switched Telephone Network (ie. telephone service). SMS is part of this voice standard, and allows short messages be sent over the phone network, and was very popular before the rise of smart phones and fast data connections.

Your mobile phone, whether smart or not, as chips and radios that support these frequencies, connecting voice calls and other voice services.

The mobile carrier also provides data services, which are designed to carry network traffic like the internet. You have heard of things like '3G" "4G" "LTE" "5G" which refer to these faster and faster data connections. (Confusingly, some of these encompass voice and data, but let's keep is simple and just consider these 'data' connections for now). These can use a different set of signals and radios than the voice service mentioned earlier. Smart phones support both voice and data connections, though some older phones support only voice.

So, the best way to think of this that an old-school phone call uses the phone network, which counts as 'minutes' and every other application uses the data network, and counts that in gigabytes (GB). Therefore Whatsapp, which is an app, uses data or Gigabytes, not minutes.

OK, now, lets try to not get confused: lets say you have NO APPS on your brand new phone. You give your Mom or Dad your new phone number, and they call you. That app, the one that rings when they call, is what counts as minutes. EVERYTHING ELSE on your phone, counts as data or gigabytes.

Yes, you can make a voice 'call' over Whatsapp, or Facetime, or lots of other apps. But they are using the Gigabytes to send a voicecall over the data network. They don't count against your minutes, because they are not using the voice network. Its best to think of this by app: there is one app on your smartphone that counts minutes, and that is the phone app. Everything else counts gigabytes (data).

Wifi is using a different network to support the data side of your phone: when you are on Wifi, your phone is connected to the local Wifi router, NOT the carrier data network. Therefore, because your phone is using Wifi, rather than the carrier's data network, you don't have gigabyte charges. But, because Wifi only replaces the data connection with your carrier, the voice radios in your phone DO connect to the carrier. So regular phone calls, on the phone app, continue to work, as does Whatsapp. Only Whatsapp is using Wifi now, not the carrier data.

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  • Wi-Fi: The owner of Wi-Fi has to pay. Just to be sure, turn off Data.

  • Cellular/ Mobile Data on: It counts against the allocated bandwidth or simply provided data in a pack. Like 1 GB for some money etc.

  • Minutes are counted when the phones behave as internet-less devices and this is paid separately.

A simple analogy would be to see the icons in the top bar. The one similar to 5 dots or 4-5 bars is what you see as minutes. The one besides that with 3G, 4G, LTE or E etc is what determines cost and quality of WhatsApp calls. Same for the Wi-Fi icon.

One can have all three things separate and exclusive of each other. You're on the right track.

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    Thanks! Just to check I've understood, can I think of it as a flow diagram as follows? Ask "Uses the internet? (Y/N)". If No, then minutes. If Yes, then ask "Uses wifi? (Y/N)" If No, then data; if Yes, then neither minutes nor data, but paid for by whoever pays for the wifi (e.g. at home that's me - I buy unlimited so it's fine - and elsewhere it's a library or café or whoever). I knew it would become clear if I got some good help! Do you know roughly how much data a 1-minute Whatsapp video call uses? Some say about 3MB - less than I thought. – ool Aug 12 at 14:08
  • @ool That is correct! I'm afraid I cannot tell the WhatsApp video data usage. Found nothing in FAQ either. – ankii Aug 12 at 15:01

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