SensorKit phone call/text message question

Hi, we have several clarification questions on how SensorKit collect phone call/text message data:

1. when people use non-native apps, e.g. WhatsApp, to make calls or messages, will they be picked up as phone call or text message by SensorKit, or will they only be counted as app usage?
2. When people react to a message by long-press the message and thumb-up/heart it, will it be counted as one outgoing message or not?
3. If the incoming call is not picked up, will it be counted as one phone call or not?
4. When people text within a group, will the unique number of contacts be 1 or the number of members in the group?

Thanks! Yu