Any customers who do not sign up for a so-called Eurotariff will automatically be put on one from 30 September, unless they are already on another special roaming deal from their mobile phone operator.

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"The FBI is asking anyone with information about the unmanned aircraft or the operator to contact us, " said Special Agent in Charge John Giacalone.

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Nevertheless, Teletec is offering up a similar service which doesn't require a special phone, but instead utilizes any internet-connected device to display text that an "online operator" channels to their screen.

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