Update

It’s seems that you have iPhone 6 or less unfortunately the last update for your device is iOS 12.5.5 you can’t update it to newer version!

if you have iPhone 6s or later See this article to learn how to update your iPhone >>>Update your iPhone, iPad, or iPod touch - Apple Support

If you have trouble with update see this article >>>If your iPhone, iPad or iPod touch won’t update - Apple Support

You need a new phone. Your phone is obsolete.

Sorry, but you can only install apps on your phone, that are supported by the iOS .

If you can't update the iOS anymore, you can't install newer versions of apps.

Unfortunately you can’t update it!!

kavindu241 wrote:

How to do it

You go to your local Apple Store or authorized retailer and buy a new phone.