Hello and welcome to the forum. I set my phone up to have the *home* button answer calls and after 15 test calls it's still functioning properly. I would suggest turning off/on that setting and also a restart on your phone will sometimes help these little glitches.
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Thanks for your response. I took the phone to a tech repair center and the tech was able to duplicate the problem. I had really brought it in for a "Sim Card Removed" error I have suddenly started getting. He couldn't find anything wrong with the Sim card or the Sim tray, but because of the Home key not answering the calls, he replaced my phone.
Now, the Home key works to answer calls, but that mysterious "Sim Card Removed" error reappeared within hours of leaving the repair center and has happened twice in two hours.