If a request for a Skype for Business meeting includes a dial-in phone number and conference ID, then you can call into the meeting. Calling in is handy if you don’t have access to a computer at the meeting time.
If you aren't using a smart phone or you're not connected to Wi-Fi, you won't be able to see anything that the leader or others may present, but you'll be able to hear and speak.
If you do have access to a computer or if you're using a mobile device and are connected to Wi-Fi, you can connect to the meeting using Skype for Business with the usual functionality--like the ability to see what others are presenting or the ability to present content yourself (if you have it on your mobile device). For details, see Join a Skype for Business meeting.
On your phone, dial the conference number listed in your meeting request.
Tip: If you’re traveling, click Find a local number in the meeting request to find the numbers available for your current location.
Enter the Conference ID by using your phone dial pad.
Enter a PIN and work number or extension only if:
You’re the meeting leader (organizer) and calling from a phone that isn’t connected to your account, such as a cell phone.
You’re an attendee of a secured meeting that admits only authenticated callers.
Note: If you don’t remember your PIN, in the meeting request, click Forgot your Dial-in PIN, and follow the instructions about resetting your PIN. If you're a Skype for Business Online user, you must request a PIN reset through your administrator. See Reset your PIN for more information.
Depending on the Skype for Business meeting settings, you might have to wait to be admitted, or you might get connected automatically.
(Optional) When in the meeting, press *1 on your phone to get a list of the options you can use, such as mute, unmute, and so on.