People use their iPhones in a slew of different ways and there’s an app for almost anything you can imagine doing with your smartphone. There are so many apps out there currently that it’s almost impossible to try them all out and make a decision whether you should keep one or the other. This is why most people think twice before installing an app on their iPhone and instead spend a while reading app reviews before making a decision.

If you head over to the marketplace you’ll find that there’re 5 million apps you can download and use but only a handful of these are what you’d call must-haves. These are the most useful applications that give you instant access to third-party services on your iPhone and offer a free and reliable option for you to use anyway you want.

Below you can find a list of 15 best free iPhone apps you can download and use on your smartphone right now. The list is based on user reviews and votes from iPhone users all over the world.

IM+ Social Networking iPhone App

The social side is now present on your smartphone and there’s an app for each of the popular social networking sites out there, but there’s also one that incorporates all of these options in a single, easy-to-use app.

The IM+ iPhone app offers just that, namely the possibility of accessing multiple networking sites by using a single app and many iPhone users out there are praising it for being the best social app for the iPhone.

Instagram iPhone App

You’ve probably heard by now about the amazing Instagram app that’s been downloaded by a huge number of users in a very short amount of time.

This one lets you take full advantage of your iPhone’s camera and enables anyone to improve ther pictures in just a few clicks using by using multiple filters such as Rise, EarlyBird, Amaro, Sutro, Hefe, 1977, Brannan, Vintage and many more. This easy to use app makes it possible for anyone to improve their private photo collection on the fly by adding custom filters to their pictures and we can find yet again the social side in Instagram that enables users to share their pictures on popular sharing sites like Tumblr, Facebook, Flickr or Twitter in just one click.

It’s probably the best camera app for the iPhone you can find right now and definitely a must-have for anyone who uses their smartphone to take pictures.

Dropbox iPhone App

The Dropbox service enables users to save their files to the cloud and share them among multiple devices very easy. You can use it to save your photos and media on a remote server and access them anytime you want from multiple devices you may own, such as desktop, laptop, smartphone or tablet.

The Dropbox app is one of the most popular apps for the iPhone and definitely a must-have for anyone with an iPhone.

Wikipanion iPhone App

With the Wikipanion app for the iPhone you can have an entire encyclopedia right at your fingertips that will allow you to browse the enormous Wikipedia database.

You’ll get a table of contents for improved browsing, multiple search methods, the possibility of bookmarking and saving images for future reference and a whole slew of other features that will make your experience with Wikipedia more enjoyable.

The Wikipanion app is the preferred method for accessing the Wikipedia information on your iPhone.

Mog Streaming Music App for iPhone

There are a lot of people out there who enjoy music on their iPhone and one of the best ways of acquiring music on your iDevice seems to be the Mog app. The Mog database is huge and you can enjoy over 10 million songs from your iPhone. Users can connect either via WiFi and start downloading their favorite tracks on the iPhone. This one is most likely the best app for music lovers who are currently using iDevices to handle their prvate media collection.

Evernote App for iPhone

There are a lot of people out there who use the Evernote app for iPhone to organizing their day with the aid of only their smartphone. This handy app will help users take notes, pictures, screenshots and everything they need to plan and organize their daily schedule. The best thing about this app is that when you install it on multiple devices your notes will be saved to the cloud, thus allowing you to sync and receive notifications about your schedule on multiple devices.

Evernote is praised as one of the best organizer apps out there and best of all it is free of charge.

Amazon iPhone App

Everyone shops online and most of us take a tour on the Amazon website everytime we’re looking for something. The Amazon app for iPhone is a great option for anyone to search and read reviews about products they’d like to acquire or organize their wishlist. That’s not all though, you will also get a price comparison tool that will help you out a lot before making a decision. Other features of the Amazon app include barcode scanning, advanced search feature and many others that will help you decide on your final shopping list.

TripAdvisor iPhone App

If you like to travel and need a little help with planning your vacation, the TripAdvisor app for the iPhone might prove to be very useful. The TripAdvisor app comes packed with user reviews, maps, photos and everything you need to know about almost any destination you can think of. It’s definitely the most popular among all the travel apps available in the Marketplace and will even allow you to book your tickets for your next destination and also choose the best prices for the flight there.

Once you’ve reached your destination the TripAdvisor app will help you find the hot spots using the built-in maps, restaurants, hotels and anything else you might need to find there.

Skype iPhone App

The Skype app is yet another must-have for your iPhone and will allow you to communicate for free with your friends and family using your smartphone and a 3G or WiFi connection. You’ll also be able to video-chat which makes the whole experience a lot more enjoyable and make good use of your iPhone’s cameras dedicated to video-conferencing.