The most challenging was to implement a third-party VoIP library, especially if it has a lack of documentation and examples. After that creation, own calling interface, which can handle incoming, outgoing calls, multiply calls, and so on.
The interview was answered by one of Onoff's engineers based in Estonia. Onoff Telecom is a licensed telecommunications operator in 21 countries and supplies numbers from 33 different countries.
I like the Telegram application. It is functional, simple, and secure, without bloatware inside. Maximum-focused application.
Quite a lot of 7 years. (6 years and 11 months.)
I believe that the application should be simple and understandable, so users can easily use our application. Of course, stability and performance are important too, but it is matter-of-course, we always trying to achieve the best result, despite the huge number of different devices and complexities.
I think it is 3 main points, which make us better: First of all, you can get a real mobile number, with SMS and even MMS (Not yet all countries support it, but we are working on it). Second is our callback system, which allows users to spend less on international calls. And third, is easy to get a number, you can get a number in a minute and start using it.
We are working now on a feature, which allows the user to use his number offline when the user has no internet and only a GSM network available. Quite a big and complex feature, but we will do our best to bring it to the user.
Please don't hesitate in sending us feedback! How are you using our application? What kind of functionality you are missing? What do you like? What not? It is very important for us to make our application better, and to understand what you need, so that we could make you happy.
Onoff - Your Second Number With An App!
What if you could get a second number in minutes, without the hassle of using a second phone or a second SIM card, but just by downloading an app? You dreamed of it, Onoff made it happen!
You will want to use a second number for:
> Having a separate professional line - separate your professional and personal life
> Protecting your privacy when you are online - your safety is our priority
> Selling goods online in total confidence - safely communicating with your potential buyers
> Carrying only one phone on you - less weight in your pocket, less hassle between switching the phones
> Being able to use your phone number from any smartphone and even from your web browser - we want you to have a number as flexible as your email!
> Make low-cost international calls - the world is just one call away
With Onoff, you also have:
-Unlimited calls and SMS
-Integrated visual voicemail
-Synchronization of all your contacts list
-Possibility of porting an existing number, in order to use it in the Onoff App
-An app compatible with all SIM cards to always call on the best network
-Numbers from more than 30 countries available
And there’s much more!
In the application, you can subscribe to a number or a calling plan, the prices of which vary depending on the nationality or region chosen, as well as the duration (1, 3, or 12 months). Payment will be made through your iTunes account after confirmation of purchase and will be withdrawn 24 hours before the end of each billing cycle. You can deactivate automatic renewal in the settings of the App Store after purchase, at least 24 hours before the end of the current subscription period. With your Onoff number, you can make unlimited calls throughout Europe. For communication outside of Europe, you can also purchase credits, valid for any destination!
Any demonstration product offered within promotions will be automatically terminated upon first purchase. We cannot guarantee the systematic compatibility of numbers with verification services by SMS. Onoff: several numbers in one application, without changing the SIM card!
Date: May 11, 2021
Developer: Onoff Telecom
About developer: The interview was answered by one of Onoff's engineers based in Estonia. Ono ... Read more