Intel Corp., whose products dominate the world of computing, said it’s going to wind down a multibillion-dollar, multidecade effort to grab a viable stake of the mobile phone industry.

After its one significant customer, Apple Inc., said it will return to using Qualcomm Inc. chips, Intel announced Tuesday it will exit the 5G smartphone business and complete an assessment of the opportunities for existing chips and 5G modems in personal computers.

“The company will continue to meet current customer commitments for its existing 4G smartphone modem product line, but does not expect to launch 5G modem products in the smartphone space, including those originally planned for launches in 2020,” the company said in a statement.

Intel Chief Executive Officer Bob Swan, who stepped up from the chief financial officer role in January, is stopping an effort that his predecessors poured billions of dollars into over the years. With Apple as an exclusive customer, Intel still has struggled to make money in modem chips, even as its position in other markets has fueled revenue and profit growth.

Analysts had speculated that the ascension of a leader from a financial background to Intel’s top job would prompt a reassessment of some business units that haven’t delivered. As the phone market eclipsed the personal computer industry in volume, and smartphones became more computer like, Intel has struggled to win customers. Before combining the mobile business into its PC chip division, the company reported billion-dollar losses as it paid out subsidies to try to woo phone and tablet makers.