To remove apps permanently, there are several ways.
Method 1: Delete apps directly from an iPhone
Pros: Easy to use.
Cons: Only delete a single app at a time, but do not apply to multiple apps deletion.
It's the easiest and common way to remove apps. Long press the icon of apps until a cross shows up. Touch the cross and a window will pop up. Tap "Delete" to confirm your choice and the apps will disappear. To delete next app, repeat the above steps.
Note: Before deleting iPhone apps, you'd better make a backup in iTunes library in case. Once you need them, you can sync it again to your iPhone by using iTunes.

Method 2: Delete iPhone apps (as well as all of its data) with iPhone Data Eraser
Pros: Permanently delete all apps and all of its data with one click.
Cons: All deleted data will be unrecoverable unless you download them again.
To completely wipe out junk apps and free up space, this method is very useful for you. By using iPhone Data Eraser, you can delete all apps permanently from an iPhone as well as all of its data. Remember! All deleted data will be unrecoverable unless you download them again.


Tutorial on how to erase apps quickly
Step 1: Run the program & Connect iPhone to PCDownload, install and run the program on your computer. Then connect your iPhone to PC using a USB cable. After your iPhone is detected, two options will be shown in the first interface.
Step 2: Erase all data on device
Choose "ERASE ALL DATA ON DEVICE". (To improve the software, programmers are developing new options of erasing part of data.)

Step 3: Start deleting apps on your iPhone
Now you can start deleting apps by hitting on the button. Previously, you can change the default level of data deleting from medium to high or low. Then click Start button to begin deleting photos from your iPhone now.

The whole process will take you a few minutes. Make sure your iPhone is connected firmly to your computer
Method 3: Delete (Hide) pre-installed apps from iPhone & iPad
Pros: Easy.
Cons: Can just hide apps, but fail to delete them permanently.
Actually, the apps rooted in the factory settings of your iPhone can't be deleted. You can just delete apps that you downloaded to your iPhone. However, to hide the pre-installed apps from your iPhone, you can by use content restriction tools built into iOS.
In particular, you should tap Settings > General > Restrictions > Enable Restrictions by setting a restrictions pass-code.
You can hide any preinstalled apps as needed.

Different methods cater different needs. If you need to restore your iPhone to factory default settings to free up storage space, iPhone Data Eraser is a perfect choice.


Related Guides & Articles
• How to Delete Duplicate Photos on iPhone
• How to Avoid Deleting Important Apps in iPhone
• How to Delete Duplicate Songs on iPad