Business briefs: The IPhone may have issues

Apple Inc. (AAPL) has issued a software update that creates problems for iPhones modified to work with a cellular carrier other than AT&T Inc. (T). Apple warned that the iPhone update — which adds access to the iTunes Wi-Fi Music Store and fixes some security flaws — could permanently disable phones running programs that untether the device from Apple’s exclusive partner network.

UAW-GM contract

Union leaders endorsed a tentative agreement between General Motors Corp. (GM) and the United Auto Workers that requires GM to pay out at least $35 billion for retiree health care and offers an unprecedented number of promises for future work at U.S. plants, according to a summary of the agreement. UAW President Ron Gettelfinger said he’s confident members will support it.

100 years of the San Francisco Opera

Centennial season opens with world premiere of ‘Anthony and Cleopatra’ by John Adams

How an improv show hit Broadway, won a Tony Award and is now at ACT

S.F. actor Anthony Veneziale gives the backstory on “Freestyle Love Supreme”

Opinion: Can a former California dairy farmer help Trump slay Facebook and Twitter?

Retired Republican congressman works to launch Trump’s social media app by President’s Day