The device will be available to customers in January, according to the people, who declined to be named because the information isn’t public. Natalie Kerris, an Apple spokeswoman, and Jeffrey Nelson, a Verizon Wireless spokesman, declined to comment.

The iPhone, which has been the sole domain of rival AT&T in the U.S. since June 2007, will give Verizon a boost in its competition for smartphone customers, UBS AG analyst John Hodulik said in an interview. Verizon customers, who numbered 92.8 million at the end of the first quarter, may buy 3 million iPhones a quarter, he estimates.