There’s not much to be done for any physical scratches and scuffs, although if the screen needs replacing that can be relatively easily done. But what about performance issues?

We here at TheiPhoneAppReview.com have extremely close relationships with out idevices, probably to an unhealthy level, but let’s not get into that, and we are always looking for the best ways to keep them in tip-top shape.

You can do a lot to maintain the performance of your iPhone and iPad, recover functionality that may be on the fritz, and otherwise take the best care possible to make sure it works as it should.

Here are the absolute 3 best iPhone apps that will help you maintain your iPhone for many days and years to come.

TestX: protection, diagnostics – (Free) – System checker & analyzer

The TestX app is a star player in the must-have category of diagnostics for anyone who is serious about maintaining the proper functioning of their iPhone.

If you’ve ever wanted to know more about the various sensors and capabilities of your device, either as a method of improving it, or just because you’re curious about it all, this is a great app to get you started on the right track.

Whether you’ve been neglecting your iPhone for years without any specific complaint, or something just stopped working the way it always had, this app will help you get to the bottom of what’s going on.

The diagnostic tests are extremely simple to run. You can opt for a Quick Scan or a Full Scan (we recommend the later if you haven’t done one before) or select specific tests to exercise different capabilities of your phone.

One of the best features of this app is that with one tap you can create a full report of the results for the tests that you’ve run along with a full description of your iPhone.

This is not only very handy for the owner, of course, but it can be a great way to verify the quality of your phone when you are trying to sell it so you can upgrade to the newest one available.

TestM – Check phone & Report – (Free) – Test, Buy & Sell Phones

It’s no secret that we’re all quite protective of our devices. Let’s face it, they do a lot for us and we depend on them for an ever increasing part of our day-to-day lives.

So what do you do when you’re ready for the newest model and you want to sell the one you have but the device seems sluggish, some part of it just doesn’t work right?

Maybe you just want the peace of mind knowing that when you do see it, it passed a thorough battery of tests with flying colors.

TestM’s focus is all about selling your iPhone and, in preparation for that, either verifying it’s in great shape or helping you get it to a condition that will net you the most return.

In fact, “Find Repair Shops” is one option in the left side pop out menu.

It’s simple to use and includes a broad array of tests that you can run individually or as a group.

Like TestX it will also create a report that includes a full description of your iPhone.

At the bottom of the report result screen there’s also a button to share the report with your buyer making the whole process quite simple and easy.

One of the best things about this app is that it makes it very easy to find a repair shop.

If it doesn’t find one right around you, you can do a search for a city nearby.

Phone Doctor Plus – (Free) – Test, monitor, trade-in

For anyone who wants to see at a glance with just one tap what the status of your iPhone is, you can’t do better than Phone Doctor Plus.

Once you tap “Status” you’ll see six categories with a summary status for each.

You can then tap a category to drill down to more specific info.

There is lots to see and you will definitely get great info about your phone, it’s detailed specifications, as well as info about all of its capabilities.

At some points, however, you’re left guessing. For example, if you drill down into “CPU”, you see how much of your total cpu capacity is currently in use, and you also get a readout for all the cores on any multi-core iPhone.

But it also says “not done yet” for both single-core and multi-core while showing results. So what exactly isn’t done yet?

The distinguishing feature of this app is that it will let you login to get a trade-in price for your iPhone.

We can’t attest to whether or not it’s a fair offer, but at least it’s one data point as you try to determine what a good price is and whether or not you really want to sell it.