IPHONE 4S contract package, 286 models, 3 years. Seek an explanation

You can wait two years before renewing your contract and choosing other packages. And no matter whether you are mobile or Unicom, there are signal problems, and short messages are sent in groups. You have to pay a dollar once you get through, and you have to pay it again as soon as you open it. Unicom is free, and the mobile 2G network is only 20KB/S, and the full signal is not as good as Unicom's 2-grid signal. Throw away the card in a month, the mobile phone will be scrapped, and I don't understand it upstairs.