For businesses choosing a phone system, the question is no longer simply how to make and receive calls. It’s where those calls should live: on an internet-based VoIP system or a cellular network using VoLTE. Each has its advantages, and the right fit depends on your team’s needs.

Teams Phone has supported multiple assigned phone numbers for some time, but mobile users have had limited access to that functionality. A Microsoft 365 update that rolled out from late July through mid-August 2026 extends full multiline capability to Teams mobile on iOS and Android, bringing mobile users in line with the desktop experience.

The terms FXS and FXO come up in almost every conversation about analog telephony and VoIP integration, but they’re rarely explained clearly. They’re not interchangeable, and confusing them during a phone system setup creates problems that can be difficult to troubleshoot after the fact.

Switching to a new phone provider doesn’t have to mean starting over with new numbers. Number portability — the right to take your existing phone numbers with you when you change carriers — is a federal protection established by the Federal Communications Commission (FCC) and available to virtually all businesses.

A single phone call can contain more information than anyone can reliably remember. Handwritten notes may not capture every detail and can be time-consuming. Call recording is a standard feature in modern VoIP systems that gives businesses an accurate, searchable record of every conversation.