I have had this phone for over a year and keep many things in my Calendar app that came with my Apple 4S phone. Just recently in the past 7-10 days, the bolded "+" sign that allows me to add something is not bolded any longer and I cannot get anything into my calendar. Have I touched a setting that I shouldn't have, added a conflicting app, I just cannot seem to get it back. I have gone through everything in Settings but nothing seemed applicable for that issue. I would certainly welcome anyone's solution. Thank you. Tom.
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