The difference is what each one can physically hear.

Your phone records its microphone. It hears the room: you, and anyone in it with you.

Your laptop records its microphone and everything coming out of its speakers. It hears you and the people on the call, because their voices arrive through the computer.

SituationUse
Video call on Zoom, Teams or MeetLaptop
In-person meeting or interviewEither; phone is easier
Conversation in a corridor, taxi, or on sitePhone
A call connected on that same phoneNeither; see below
Somewhere with no signalPhone
You want a transcript as it happensLaptop
You want to ask Junior questions mid-callLaptop

Calls on the phone itself

Junior can't record a call that's connected on the same phone. While a call is running — a normal phone call, or a Teams, Zoom or Meet call you joined on the handset — the call holds the microphone, and only one app can hold it at a time.

To capture a call like that, join it from your laptop and record there, or send Junior's bot into the meeting so nothing depends on your device at all.

The one that catches people

Recording a video call on your phone captures your side of it clearly and the other side barely, or not at all. Their voices are coming out of your laptop, on the other side of the desk. It looks like it worked, because the timer ran and the waveform moved. Use the laptop for anything on the laptop.

Questions

Can I record a phone call?

Not on the phone that's on the call. A connected call holds the microphone, so Junior won't start while it's running and tells you the microphone is unavailable. That's true on speakerphone as well. Record from your laptop instead, or send the bot.

Should I record on both at once as a backup?

You can, and you'll get two calls in Junior rather than one better one. If you want a safety net for an important interview, the laptop recording is the one to trust, and it already keeps recording locally through a network drop.

Does a phone recording sound worse?

Not inherently, but placement matters far more than on a laptop. A phone in the middle of a table with four people around it'll lose whoever is furthest away. Put it closer to whoever you most need to hear, and off any surface that carries vibration.

What if I only have my phone and the call is on Teams?

Joining on the phone you want to record with doesn't work: the call takes the microphone and Junior won't start. Send Junior's bot into the meeting instead — it joins on its own and doesn't need your phone.