Who's got the best or Cheaper Iphone family plan?

4 Maybe 5 Family members here getting phones.
I need to know who has the best family plan? Like cheapist
for the Iphone 4s probably maybe the 5

Rumors out of Korea indicate that base version of the next iteration of Samsung's Galaxy S flagship line, the Galaxy S5, will come with dust and water resistance.
http://wallpapersandmobiles.blogspot.com/2013/10/samsung-galaxy-s5-to-withstand-elements.html

  • Would this be cheaper than an iphone plan? I have an iPhone 5 and I don't have a sim or plan with it. Could I just carry a mobile hotspot with me instead of getting a $100/month plan? If so, what carrier has the cheapest?
  • Will my cell phone plan with verizon be cheaper if I get the iPhone separately? I plan on switching to Verizon soon, yet I will be on a budget since I'll also be living on my own for college. So my question is, can I open up an account with Verizon, buy a cheap phone with data and texting etc. On it, THEN buy a Verizon iPhone off of ebay? Also, how much would the monthly charge be if I was to buy an iPhone 5 with its plan at Verizon?
  • Why is the iPhone 4 50$ cheaper at Best Buy? You can buy the iPhone 4 right now at Best Buy for $50 (with 2 year contract). What's the catch? Because my 2 year contract for my Droid X just ran out (I'm with Verizon) so could I go to Best Buy and pick up an iPhone 4 for $50 while starting another 2 year contract with Verizon?
  • Is tbere any major différence between thé iPhone 6 and the 6s? Whooppeee is Xmas again and my daughter wants new 2nd hand) iPhone… 2 years ago almost bought her 5 before i réaliséd that it was 5s she wanted ( cos thé 5 sucks?) And I don't want to screw up this year…