To make a conference call on a phone, the general steps are:

1. Call the first person you want to include.
2. Once connected, tap "Add call" or similar option.
3. Select the next person from your contacts and call them.
4. After they answer, tap "Merge calls" or "Merge" to combine the calls into a conference.
5. Repeat steps 2-4 to add more people to the conference call.
6. When finished, end the call normally.

For smartphones like Android or iPhone, the built-in calling app usually supports this feature with the buttons described. The number of participants depends on your carrier but is typically up to 5 for iPhones and 5-6 on Android without third-party apps. If using a desk or conference phone (like Cisco), the conference call is made by pressing the "Conference" button during a call, dialing the next party, then pressing "Conference" again to add them. Using software like Webex or dedicated conference call services can allow many more participants and additional features. Would details for a specific device or software be helpful? Or instructions for a general phone setup? () () () () ()