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May 29, 2015 10:24 PM in response to Deenell 3by sberman,As this dialog suggests, I believe on CDMA networks (e.g., Verizon), SMS and cellular calls cannot occur simultaneously as both use the same voice channel.
http://forums.imore.com/iphone-5s/269542-can-t-sms-while-phone-call.html
This is yet another advantage of GSM networks (e.g., AT&T).