Given the money the US military has (equal to 50% of the entire Russian economy), you'd sure think they could afford to throw whatever was necessary at improving security for Trump's iPhone situation. I suspect the point of an article like this, which is an off the record leak of internal information that wasn't authorized, is to get Trump to abandon the iPhone period. I don't think these insiders want to bother with trying to increase the security for how things are now (they may view it as very impractical), they're seeking to embarrass Trump into changing behavior (good luck).