Verizon FiOS and DSL networks in California, Florida, and Texas were transferred to Frontier Communications today, completing a $10.54 billion sale announced last year. Although Frontier promised it would be "ready to go day one," there were some problems that left business and residential customers temporarily without service.

@FrontierCorp still no internet for me which is vital to my business. After being on hold for an hour I was disconnected. I'm not delighted — McStuffins M.D. (@GoCartMozart35) April 1, 2016

There was a "technical issue" involving the integration of systems early in the morning, Frontier spokesperson Brigid Smith told Ars. She did not provide specifics on the cause of the problem or the number of customers affected but said it primarily disrupted service to enterprise and carrier customers in the three states. However, residents have been reporting problems as well through Twitter and the Down Detector website.

The technical problem was resolved at 9:30am ET, Smith said, but customer reports indicate that some have remained without Internet access into the early afternoon. In Florida, an unrelated fiber cut in Tampa caused further outages, but the problems in Texas and California were apparently due only to the system integration mishap.

This is not the first time customers have lost service when Frontier took over following an acquisition. When Frontier bought former AT&T territory in Connecticut late in 2014, Frontier messed up the changeover and left some customers without service for weeks.

For now, it looks like this outage won't be nearly as bad as that one.

"My overall impression is it is going very smoothly for the magnitude of the transaction," Smith said. "It's very manageable at this point. We're making apologies, any disruption in service is something you don't want to happen."

Frontier's customer service team has been active on Twitter, replying to customers who are complaining about outages.

Across the three states, Frontier is gaining 2.2 million or so customers from the Verizon purchase.