My personal preference is MagicJack. I don't want everybody to have my cell #. I prefer companies that bill me (credit cards, utilities, etc) to have their own number which is my old landline. MagicJack fits the bill for me. Most of the time I don't even answer the phone and the voicemail gets sent to me via email.
I'm not going to debate absolutes, but it is patently obvious that Android is relatively more open than iOS or Windoze by such an immense margin that your statement seems, well... asinine. Could it be better? Yes, absolutely. But, given the BS business model that Microsoft has always had (which is really the same for Apple, though they are better at marketing), Android is a hippie commune by comparison.
I switched to Linux Mint Debian Edition a while back. Cinnamon is a great desktop. Don't miss the steaming pile of Ubuntu. It was great while it lasted, but then came Unity and now they're hitting us with adverts? I don't get it. Seems like they're trying to kill demand.