1. From your Calls  list select the new call button. 
2. Select all the participants you want to call. 
3. Select the Call  button. 
   
   Note: For any group calls with more than 25 participants, they will be ringless. The group will receive a notification that the call has started and can select the Join Call button when they're ready. For video calls with less than 25 participants, when you start a video  call , you can choose whether you want the call to ring everyone in the group or be ringless. Ringless calls will send a notification to participants without interrupting them with a ring and if anyone needs a little extra "nudge," you have the option to ring them individually. 

Android 4.0.4 - 5.1

1. From your Calls  list, select Start a new call. 
2. Select New Group call . 
3. Select all the participants you want to call. 
4. Select the audio , or video  button.

You'll need a little Skype Credit or a subscription to call someone on their mobile or landline. If you've already saved the person's contact information you can tap or click their name from your contact list, or use the dial pad button  to enter their phone number. To call an international number, select the country/region from the drop-down menu. 

Follow these steps if you already have the person in your contact list:

1. Find the person you want to call from your Contacts  list. 
2. Select the person you want to call, and then select the audio , or video   button.
   If the person has more than one phone number saved, you can select the number you want to call from a drop-down list. 

Can people call me in Skype from their mobile or landline?
Yes, but you'll need a Skype Number for them to call you on. 
 

Up to 50 people (49 plus yourself) can be on the same audio call. The maximum number of video streams will vary depending on the platform and device you are using. 

Yes, use the dial pad to enter toll free numbers on Skype. The following countries and number ranges are supported and are free of charge to all users:

France: +33 800, +33 805, +33 809
Poland: +48 800
UK: +44 500, +44 800, +44 808
USA: +1 800, +1 866, +1 877, +1 888
Taiwan: +886 80

Skype is not a replacement for your telephone and should not be used for emergency calling. 
There are some circumstances which limited emergency calling is supported over Skype, learn more.