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So I'm looking at my account online and I don't see the Data Add-On that I purchased on August 18th for $15?  I received a text saying that my 250 MB has been used up, but I don't see where the data add-on as been used?  I checked my usage history an...

I have inserted the existing SIM card into my Samsung S4 mini smartphone and when I turn on the phone, SIM card is not reading it.  Am I supposed to do something online to fix this?  Please help.