Hello Client,
Greetings!!
From your description, it is clear that you want to develop a calling application which will use 3G/4G connections or WiFi to conduct calls safely and privately.
VoIP or IP telephony, methodology shall be used to develop the app for the delivery of voice communications and multimedia sessions over Internet Protocol networks. Open sources VoIP platforms such as FreeSWITCH, Asterisk, WebRTC, Opensips, and Kamailio shall be used to address the various VoIP requirements.
The app will allow users to manage contact and personalize incoming and outgoing calls. Calling via Wifi or 3G/4G/LITE network, the user won't get hit with expensive service charges. And best of all, there are no minimums, contracts or worries.
#Technology stacks using:
>Mobile :
iOS: Swift and Objective-C, Android: Java, Cross, and Hybrid: Ionic 3, Meteor, Cordova, React Native, Xamarin, PhoneGap
>Version Controlling:
Git, Github, Bitbucket, Gitlab
>Project Management Tools:
Jira, Trello, Asana
I'm glad to say that in Mobiloitte we build apps that can be easily deployed on Android and iOS and work flawlessly on all mobile. We have Top-rated developer having extensive expertise in Android and iOS app development, hence a perfect fit for your project.
I assure that you would be happy to choose us as our mission is to build a long-term relationship. We are just a click away to help you.
Waiting for your response.
Best Regards,
Madhu D.