I know lots of people with iPhones that still seem to retain their home training. It's not the phones, per se, it's the people using them.
What really bothered me were two things about the situation--
It seems dismissive to the chef and staff of a really good, local restaurant to treat it as though it were no different that grabbing a meal at Chili's. Basmati's deserves more respect. They have candles and low, soothing Asian music playing. They are trying to set an atmosphere -- and these women totally ignored these cues. As a matter of fact, they whipped out some tiny, bright led flashlights so that they could read the menu, throwing a blue/white glare through the room.
Maybe it's just the economy, but it also seemed tacky to go out to a nice place, order dinner and a few bottles of wine, and talk on the phone the whole time. It's gluttonous.
As for why we didn't say anything...well, first I know business is slow this time of year and I didn't want to put the server in a position that may have jeopardized her tip. Plus, we get to enjoy the place pretty often. If it had been my one visit for the year as a tourist, I might have felt differently.