Let's talk to you as a company specializing in mobile application design If your first question is what is the price of designing mobile application applications, it means that you are looking for the lowest prices in the market and this will not benefit you much, you may get an application that is disproportionate to your point of view or has major technical problems, the prices of application design will not be determined before you completely laugh, the prices of applications are different due to the characteristics that you need in your application, so it can't be a WhatsApp application like a Truecaller, they differ in characteristics as well as in prices, so I advise you to look for the lowest price company, but you should look for someone who can meet your requests and achieve your goal of designing a professional application..