Before starting a phone app development process, we will need to figure out which technology stack should be used: programming languages and patterns, databases, third party services, and so on. In most cases, it is a good idea to start a new iOS project with Swift - it is a latest Apple’s programming language, and most of the libraries are written in it, which means they will be easier to integrate.
Which database to use depends on a project type. Some don’t need it at all. For others, we can use a simplest (but slowest) data storage. For bigger projects, we will need to decide what will work better. On a mobile, our main choices are fast and easy to use Realm, or Apple’s default Core Data.
Most of the projects will require many additional services. For example apps for apps that have payments, we will need to decide if it is better to go with native In-App Purchases, secure and well-known PayPal, or allow users to pay with credit cards using Stripe or Braintree.
If your app has messaging and calls, we will need to decide if it will be better to set up our own chat server, or we could use existing alternatives like Twilio.
All the projects are unique, and they all will need different approaches. Our team of professionals successfully releases tens of projects each year, and we have seen which method works better for each type of application.