Professional iPhone repair service can be found in most major cities as well as many smaller ones. You can search online to find iPhone repairs near you. You need to bring this iPhone to the store. Or as an option, you can mail it to him, but it makes more sense if you take it yourself. You just need to choose a repair shop that does iPhone repairs.
Some places specialise in these, while others can repair most cell phone models including the iPhone. If you have an iPhone, you may need to find one that has a lot of experience with this generation's iPhone. When you figure it out, they'll ask you what's wrong with you, and if you know, they'll tell you. But they will still connect it to their store to check all of its functions.
A lot can go wrong with an iPhone that you may need to look for at a nearby iphone repair in Sydney. You may have an LCD screen that starts bleeding colors into each other or a screen where the liquid crystals start to turn green or another color for a weird screen effect.
Other things can break on the iPhone. For example, the battery can run out. It has a rechargeable battery but that doesn't mean the battery doesn't always charge. It may wear out or have other problems.
The battery is not intended to be replaced by the owner, but is intended to be taken to a repair shop or, in the opinion of the manufacturer, taken to the Apple iPhone store for a replacement battery or if the store Apple iPhone can convince him to do it.