Newer innovations have allowed mobile phone users to still communicate in recent floods using the GoTenna devices, which are paired with mobile phones to create their own mesh network and communicate without needing a phone signal. These are much more limited in range than HAM radios though and only have a 5-7 mile reach. It is possible to send a message further but that would have to be through the meshing or ‘hopping’ through these devices.
Another wave of survivalism began after the September 11, 2001 attacks and subsequent bombings in Bali, Madrid, and London. This resurgence of interest in survivalism appears to be as strong as the 1970s era focus on the topic. The fear of war, avian influenza, energy shortages, environmental disasters and global climate change, coupled with economic uncertainty, and the apparent vulnerability of humanity after the 2004 Indian Ocean earthquake and tsunami and Hurricane Katrina, has increased interest in survivalism topics.[19]
Each type you listed (save a couple) will have its uses in a community (group if you will), generally having a small trusted group with each having several skills in the various fields (prepper, homesteader, and survivalist) I believe would be an effective team, though as each group works together would it not be best to ensure that each has overlapping skills in case of injury, death, or other reasoning they can not fulfill their duties?
"The depth of information that is covered in this book is incredible as is the unique way that the author makes us really think about ideas, situations and resources that are mostly overlooked in the usual short-term survival planning resources. ...This book belongs in the hands of anyone who is concerned with a long-term disruption in society as we know it today. It's practical, common sense approach makes it a valuable asset to all those who wish to not only be prepared, but for those who want to thrive." -- George Romano, Simpler Times Homestead (SimplerTimesHomestead.blogpost.com)
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Also in 2011, Finelli started running the Get Prepared Expo series at the Ozark Empire Fairgrounds, bringing in hundreds of exhibitors and more than 70 preparedness seminars. Before doors opened, he’d host a get-together at Ziggie’s Cafe on North Glenstone, which he soon moved to Jimmy’s Egg on East Battlefield to accommodate the crowd. At Jimmy’s Egg, Finelli found another platform from which to preach preparedness. He started drawing a crowd—more than 330 on expo weekends—so Finelli made Jimmy’s Egg a weekly affair. On Monday nights, his radio instructors showed up or Skype’d in to mold the minds of 50 to 100 students. The meetups—a name borrowed from Ron Paul’s 2012 community get-togethers—were also social events, although Finelli kept the BS to a minimum. 

The overall contents of your doomsday supply list will be based very much on what sort of shelter options are on the table, and how well-stocked with food and water such a safe house is. To get through that critical period of fleeing to a safe location, survivalists recommend keeping a "bug-out bag" on standby, with enough supplies to get you through the first 72 hours or so.
Dozens of websites and books offer advice on supplies to have on hand and in stock if "the end of the world as we know it" – TEOTWAWKI, as it's known in survivalist circles – comes to pass. Here, then, is a rundown of the supplies you'll need to ensure that this proverbial "end of days" is not an end for you and yours, but rather a new beginning. [Could Cockroaches Really Survive a Nuclear Blast?]
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For the Soon to Be Ready for Anything Prepper

The Ultimate List of the 8 Most Important Surviving Skills that will Make the Difference between Life and Death during a Crisis