Fidelity Investments, Boston, plans to offer a new paging service to Spartan Brokerage account holders.

Spartan Brokerage is a Fidelity unit that caters to active traders who have at least $100,000 to invest, said Stephen A. Cone, president of Fidelity customer marketing and development. The service will let customers arrange to be paged when certain securities or indexes change by a specified amount. Tentatively called Instant Alert, the service will be available in a few weeks, Mr. Cone said.

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