Ms Filippetti said a smartphone tax would be at a "very low level".

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Rather than state on her "Dinner with Bevy" invitations that smartphone use is prohibited, Ms. Smith says she sends "unspoken signals" to discourage tweeting and texting, such as hand-delivered invitations and seating cards lettered in calligraphy.

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Knowing how to take a good smartphone self-portrait has been an important professional skill for Ms. Craig.

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Ms. Abdul-Hakeem, standing beside the pool, was looking at a photo on her smartphone, the police officer said.

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