Vodafone Group Plc will expand into Zambia by offering high-speed mobile-data and Internet services in the country through its partnership with closely held Afrimax, extending its reach into sub-Saharan Africa.

The two companies will offer customers 4G data services using the Vodafone Zambia brand, Newbury, England-based Vodafone said in an e-mailed statement on Monday. The deal includes the opening of Vodafone-branded stories and providing services to businesses in the southern African nation.

African phone companies are broadening their Internet offering to help offset declining voice sales as consumers leapfrog fixed-line technology in favor of smartphone devices. Vodafone has stakes in Johannesburg-based Vodacom Group Ltd., Safaricom Ltd. of Kenya as well as operations in Ghana.

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