North Texans who had phone, Internet and cable service with Verizon have been switched over to Frontier Communications.
The transition took place on Friday.
A 2015 sale of Verizon's phone, internet and cable service to Frontier affects 3.7 million customers, Frontier officials said.
"Frontier Communications is completing the transition of over one million customers in Texas to the Frontier network including all voice, video, data and FiOS customers. Given the size and scope of this transaction, some of our customers experienced service disruptions," Frontier spoeksman Lliam Morrison told NBC 5 in a statement.
"This is not the result we intended and we apologize to our customers experiencing any problems. We are devoting significant time and resources to successfully resolving any and all issues because we understand and appreciate that consumers rely on our products and services to conduct business, communicate with friends and family, and access entertainment," Morrison added.
Families in a Lewisville neighborhood complained about spotty Internet service, account log-in failures, poor television signals and bad customer service.
"Everybody's complaint was, 'Why are just now doing this?' I mean, you're not ready, apparently," said Lewisville resident Roger Griggs. "I want to do the autopay but I can't do the autopay because I can't log on to my account."
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Griggs' neighbor, Tatiana Lucy, complained about the lack of television and Internet service.
"Working from home you have to have that. I need to check emails," Lucy said. "I need the WiFi to hold up for what we're paying for. If not, that's a problem."
Frontier customers with questions or concerns can contact contact Frontier Customer Service at (800) 921-8101 or go to meetfrontier.com.
