The short answer is no. Unlike many other providers, OnSim services are designed to work directly through your phone’s existing calling network.
Virtual Landline Service (Diverted Service)
If you are using our Virtual Landline without an OnSim SIM card, the process is even simpler:
Seamless Routing: We provide you with a virtual number that automatically "points" to your existing personal phone.
Direct to Your Phone: Incoming calls are routed straight to your current mobile or landline number.
Zero Maintenance: Since there’s no app to update or keep open, you’ll never miss a call due to a software crash or battery-draining background app.
OnSim Mobile Landline (SIM Service)
Our Mobile Landline service is built for reliability and simplicity. Because we provide you with a physical (or eSIM) mobile SIM card:
No App Required: Calls are handled by the SIM, just like a standard mobile call.
No Internet Needed: You don’t need a data connection or Wi-Fi to receive calls—it works wherever you have a mobile signal.
Two Numbers, One SIM: You get a landline number and a mobile number on a single SIM card.
Note: While an app isn't required to make or receive calls, you can always manage your account, change your divert settings, or view your bills by logging into the OnSim Web Dashboard.