Perhaps this was a long time ago, but a current answer would be, "I'm using voice over wifi since there's no cell service here."
Re using cellphones at the table, I've played several casinos that permit texts and short voice calls at the table, meaning 30 to 60 seconds or less. Apparently there are a few smart casino managers who've realized they lose more money chasing players away from the table to use their phone for a short time. The card counting app is paranoid fantasy on a casino's part.
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