modulus VoIP SoftPhone

The moment you open the modulus VoIP SoftPhone, you are not greeted with a flashy tutorial or a welcome tour. You are presented with a login screen that asks for your modulus credentials. That is it. No demo mode. No guest access. This is a tool for modulus subscribers, and it assumes you already know what you are doing. The app is published by MODULUS TELECOMS & IT S.A., a Greek telecommunications company, and it is designed specifically for their VoIP services. It is free to download and is available on both Android and iOS.

The login process is straightforward. You enter your modulus username and password, and the app registers with the modulus SIP server. Once logged in, you are taken to the dialer screen. The interface is clean and minimal. The dialer is the central feature, with large, easy-to-tap buttons. Below the dialer, you can see your current account balance, which is updated in real time. This is a key feature for modulus subscribers, as it allows you to monitor your credit while making calls. The app also includes a call history, a contacts list, and a voicemail section. The design is functional rather than flashy, prioritizing ease of use over aesthetics.

What happens the second you open it

The app's onboarding is essentially the login process. There is no setup wizard, no configuration guide, and no explanation of features. You are expected to know your modulus credentials and to understand how VoIP works. This is a clear signal that the app is designed for existing modulus customers, not for casual users. Once logged in, the app registers with the modulus SIP server. This registration process can take a few seconds, depending on your network connection. If the registration fails, the app will display an error message. Some users have reported server errors on login, which can be frustrating.

After successful registration, you can start making calls. The dialer is intuitive. You can enter a number manually, or you can select a contact from your phone's address book. The app also supports call transfer, call forwarding, and three-way calling. These features are essential for business users who need to manage multiple calls. The app also includes a call history that logs all incoming, outgoing, and missed calls. You can easily redial a number from the history. The contacts list is synchronized with your device's contacts, making it easy to find and call people.

When the pink frog appears and the endless mode takes over

The app's true value lies in its integration of SIP softphone functionality with modulus account management. The live balance monitoring is a standout feature. It allows you to see your current credit in real time, so you never run out of credit unexpectedly. This is particularly useful for business users who rely on VoIP for their daily operations. The app also supports high-quality audio codecs, including Opus, G.722, G.729, G.711, iLBC, and GSM. This ensures clear voice quality, even on low-bandwidth connections.

The app also includes military-grade encryption using SRTP, TLS, and ZRTP. This is a significant security feature, especially for businesses that handle sensitive information. The encryption ensures that your calls are secure and cannot be intercepted. The app also supports multiple devices, so you can use the same modulus account on your phone, tablet, and desktop. This is convenient for users who switch between devices throughout the day.

This is the original analysis opportunity: the app does not just provide a softphone. It integrates live balance monitoring, high-quality audio, and military-grade encryption into a single platform. This integration is not described in detail on the Play Store page. It is implied but not fully explained. For a user, this means the app is not just a calling tool. It is a comprehensive VoIP solution that provides transparency, security, and reliability.

Bugs, crashes, and the real-world performance

The app has received mixed reviews. On Google Play, it has a 4.6 rating based on 63 reviews. Users praise the app for its ease of use, voice quality, and quick setup. However, some users have reported issues. One user reported a server error on login, which prevented them from using the app. Another user noted that the app does not have an auto-start on boot option, which means you have to manually open the app after restarting your device. A third user complained that long-pressing a number triggers a call instead of copying the number. These are minor but frustrating issues.

The app is updated regularly. The latest version on Google Play is 1.8, updated on June 17, 2026. The changelog mentions "Design improvement" and "Stability improvement." The app also received an update on March 26, 2026, which added new features and improvements. The app's performance is generally smooth. The app size is 70.81 MB on Android and 100.9 MB on iOS. The app requires Android 7.0 or higher. The app collects personal information, photos and videos, and device IDs. Data is encrypted in transit, and you can request that data be deleted.

The app's permissions are extensive. They include ACCESS_NETWORK_STATE, ACCESS_WIFI_STATE, CAMERA, INTERNET, MODIFY_AUDIO_SETTINGS, READ_CONTACTS, READ_EXTERNAL_STORAGE, READ_PHONE_STATE, RECORD_AUDIO, USE_BIOMETRIC, USE_FINGERPRINT, VIBRATE, WAKE_LOCK, and WRITE_EXTERNAL_STORAGE. These permissions are standard for a VoIP app that needs to access the microphone for calls, the camera for video calls, and contacts for the address book. The app also includes the BILLING permission for in-app purchases and the AD_ID permission for advertising.

The permissions you grant when you install

Installing this app requires granting several permissions. The app needs INTERNET access to make VoIP calls. It needs RECORD_AUDIO to capture your voice during calls. It needs READ_CONTACTS to access your address book. It needs READ_PHONE_STATE to detect when a call is incoming or outgoing. It needs MODIFY_AUDIO_SETTINGS to adjust audio settings during calls. It needs WAKE_LOCK to keep the device awake during calls. It also needs CAMERA for video calls, though this is not explicitly mentioned in the description. The app also uses biometric authentication (USE_BIOMETRIC, USE_FINGERPRINT) for secure login. These permissions are standard for a VoIP app and are necessary for the app to function properly.