How does the bandwidth required for a voice call v...

I want to have Skype calls with participants in (4) different locations. Some locations have a strong, reliable internet connection. Other locations have less strong and/or less reliable internet connections. 
From the Skype website, I see the bandwith needed/recommended for voice calls, but I can't figure whether the needed/recommended bandwith increases with the number of call participants. 
Thanks in advance for guidance on what (if anything) I can do to improve efforts to help folks with poor broadband access stay connected!

Connect and sync. That will backup your iPhone settings, and sync your contacts, apps, etc. to your computer via iTunes. Before you hand your iPhone in for the exchange, select Settings > General > Reset > Erase All Contents and Settings - that initiates a secure wipe of the phone contents and cannot be stopped once you start it.
When you get your new phone, connect it and sync, choosing the option to restore from backup. That and the subsequent sync will transfer all of your old settings, contacts, music, apps, etc., to the new iPhone. The only thing that will not transfer are the Wi-Fi passwords and the voicemail password. Those must be set up again on the new phone (that's a security measure).

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