the sim card will have to do with the data issue?
Well, the sim card is necessary for 4G. When Airplane Mode and the Restart Connection app haven't work some people have had success by removing it and the battery, replacing the battery and powering up. Then power down, remove the battery, replace the card (along with the battery) and power up. That's supposed to reacquaint the phone with the sim card.
In my case, crazy enough as it is, if you keep getting the "Checking for updates unavailable at this time" message and do the sim card trick, the next time you check for updates it'll actually check for updates. I had put the card in backwards and when I powered up I got a "No Sim Card" message. I put in in correctly, but although the message was gone all I had was 3G. I took the phone to a Verizon store, told them what I did and what happened. They confirmed the card was bad and swapped in a new one for free. 4G came back on right away and I seem to get it quicker.
I was on .901 at the time and manually installed .902 the next day. Again, I can't say data is better because of .902 or a new sim card.
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