All phones can make calls including Android.

Calls to mobile phones and telephones are not covered by Skype. One must first purchase Skype credit in order to make these calls. However, calls from Skype to Skype, including video calls, are all free.

You can learn how to make VOIP calls on various websites like HowStuffWorks and BroadVoice. Both websites offer a variety of tutorials and guides, including on how to make VOIP calls.

Affordable conference calls can be made using several different companies' software including ATConferencing, BT and AT&T. Alternatively affordable conference calls can be made using Skype.

In general, no.

I'm guessing that you are in the United States or Canada. There are some international calls that are dialed as "one plus," including calls from the US to Canada or vice-versa, but also including calls to a number of island countries and territories in or near the Caribbean, including Jamaica, Bahamas, Bermuda, Dominican Republic, Cayman Islands, and Trinidad & Tobago. For a complete list, see the related links.

For other international calls, you dial the international access prefix, which is 011 for direct-dial calls from the U.S. and Canada, or 01 for operator-assisted calls. You then dial the country code, city code or area code (if any), and subscriber number.