Landline phones are becoming extinct, even though people in offices use IP phones to enhance their customer service and collaboration between employees. But today, people tend to use devices that are portable and convenient. For sure, the best solutions are cell phones.

It is understandable that people are switching to mobile devices because we are mobile by nature. A person cannot sit around a phone and wait for a call. This limits his activities, he wants to receive a call even if he is away from his desk. That’s why people are inclined to use mobile devices. Mobile devices change consumers’ lives, they use their cell phone to make calls, play games, watch movies, and even do business.

For sure, VoIP providers have already thought about this tendency. And they have found the best solution. It is mobile VoIP softphone.

What is a mobile VoIP softphone app?

Mobile VoIP softphone app is like an ordinary softphone for desktops just for mobile devices. Simply put, it is designed to make and receive VoIP calls to your cell phone or tablet. And regardless of what platform you use (iOS, Android, or Windows) you can find a solution for your cell phone.

Using mobile softphone, you will receive all your business calls on your smartphone, as if you are at your office. And you can make business calls keeping your personal Caller ID private by just making calls via softphone, which will use your business Caller ID. Isn’t it amazing?

Some non-techy readers might ask how mobile VoIP softphones differ from services like Skype. It is a softphone that requires a SIP/VoIP provider of your choice. When you register for SIP/VoIP provider you get a SIP address that should be configured with mobile apps.

So, let’s dig deeper into the most popular free mobile VoIP apps.


Zoiper is a free VoIP softphone application to make and receive VoIP calls over 3G, 4G, or Wi-Fi. It offers a simple user interface and superb audio quality for smooth VoIP operation. Zoiper allows the user to make both audio and video calls. It works in the background to use as little battery as possible while ensuring reliable and stable voice quality.

Zoiper can be used by end users, service providers, call centers, or any other business that wants to make the most of VoIP phone system. It also works with Bluetooth. You can pair Zoiper app to your car audio system or headset and not worry about missing any call on the go.

Thanks to the built-in QR code scanner, you can make 1-click account configuration. No need to type account details and credentials every time you log in.

Note that Zoiper softphone does not work as standalone application. To use your VoIP app, you should subscribe to any SIP/VoIP provider.

Zoiper supports almost all the most famous audio codecs:

  • 711
  • Speex
  • iLBC
  • GSM
  • 729
  • VP8
  • H264

Zoiper comes with a wide range of features that make it even more attractive. Here are the main features Zoiper includes:

  • Support for different color schemes
  • Multitasking support
  • Speakerphone mute and hold
  • Built-in echo cancellation
  • Distinctive ring
  • Call waiting
  • Call transfer
  • Conference calls
  • Call recording
  • Instant messaging
  • Call history
  • Presence
  • Click to dial
  • Encryption technology
  • Automatic provisioning

Grandstream Wave

Grandstream Wave is a free softphone application that enables making and receiving VoIP voice and video calls on any device (iOS, Android) from anywhere in the world, whether via cellular data or Wi-Fi. Both businesses and individual users can use Grandstream Wave through their SIP/VoIP accounts.

Using Grandstream Wave, businesses and end users can stay connected with crucial communications and it will also increase mobility.

The application is compatible with most third-party SIP-based communication platforms. It supports up to 6 SIP accounts, 6-way voice conferencing, and allows users to monitor their VoIP system while using speed dial with up to 24 virtual BLF keys.

It supports various audio codecs:

  • 711
  • 722
  • 726-32
  • GSM
  • iLBC
  • Opus

Grandstream Wave offers SIP telephony features such as call transfer, LDAP phonebook integration, and more. Here are some of the key features the app provides:

  • Built-in integration with mobile devices (contacts, call history, ringtones)
  • IPPBX integration
  • BLF
  • Call transfer/Pickup
  • Call recording with UCM
  • Automatic call forwarding
  • Automatic provisioning
  • Customizable themes
  • Bluetooth support
  • Call history
  • Do not disturb


Linphone is an open source SIP phone application for mobile devices (iOS, Android, Windows). It enables free audio-video calls, instant messaging, sharing pictures and files, etc. With Linphone, users can be reached anytime and anywhere, even if the app is closed. Calls can be made via Wi-Fi, 3G/4G Internet connection.

You can use its various kinds of user interfaces and enjoy all the functionalities.

  • iPhone application built in objective C
  • Android application running in java
  • Windows application written in C#

Linphone supports the following audio codecs:

  • OPUS
  • SILK
  • 722
  • AMR-WB (G.722.2)
  • AMR-NB
  • GSM 6.10
  • ILBC
  • 729
  • ISAC
  • BV16
  • 711

Linphone comes with a variety of phone features that will make your experience even more enjoyable. Here are the main features offered by Linphone:

  • High definition audio/video calls
  • Conference calls with many participants
  • Image and file sharing
  • Secure communication (encrypted technology)
  • Compatible with a large number SIP based VoIP service providers

We see that mobile softphones can play an important role in your business, if you want to keep up with technology and take full advantage of VoIP services.

There are some VoIP providers that offer their own mobile VoIP apps, but mango9 prefers to give you a freedom of choice. You can use one of the free open source mobile VoIP apps to make and receive calls. VoIP is all about flexibility and we don’t want to limit you. Try each of them and choose yourself which one is more user-friendly, offers better quality, and supports a great deal of VoIP features

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