The Missing Officer

A police officer goes missing while patrolling the freeway. While inspecting his last-known location, a detective finds a note: 710 57735 34 5508 51 7718.

Currently there are 3 suspects: Bill, John, and Jack. Can you break the detective’s code and find the criminal’s name?
Please post your guesses in the comments below?
I will post the answer tomorrow.

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