If you're not using the other methods posted here to expand your storage space across a microsd card, then this method will work for all F6 phones in giving you as much storage space as possible.
The MicroSD card method requires you to have a microsd card installed, doesn't let you eject it anytime you wish (if you do, you lose all access to apps stored on the microsd card), and special formatting of the card and modification to your phone. But this method is the only way you can install huge apps in the hundreds of MB to GB.
This method below is not new - many other posts here say parts of this. This is merely the way I did it after reading all the instructions and it works great for me (2/2015 for many months).
37 user apps in user storage, 5 apps moved to system, and still 260 MB user storage free.
(these are keyboards, tools, dictionaries, etc. - not huge storage hogging games).
Generally, this method is good if you only need several dozen useful apps installed for social, web browsing, email, etc, and are not a gamer (games that take up tons of storage), or someone who installs apps endlessly.
A far cry vs the bloated default F6 that almost instantly ran out of space after a few updates.
----
1. TowelRoot your phone to root it.
https://towelroot.com/
Rooting your phone allows you to modify files and such you normally can't.
2. https://play.google.com/store/apps/details?id=com.lonelycatgames.Xplore
X-Plore File manager.
Install this (or any other file manager than can modify root files).
Goto settings, enable SuperUser mode (the last of the three settings), check boxes to see . (dot) hidden folders.
This (or any other file manager than can see system files once rooted) will let you delete apps you don't want.
3. https://play.google.com/store/apps/details?id=com.buak.Link2SD
Link2SD
This program will let you move apps from USER space into SYSTEM space (different parts of storage in your phone). If you move an app you use into SYSTEM space, it frees up user space, letting you install more apps.
Also, you can use this to uninstall both SYSTEM AND USER apps.
4. http://androidforums.com/threads/masterlist-of-safe-to-remove-apps-come-contribute.866390/
DEBLOAT YOUR PHONE OF APPS YOU DON'T NEED OR USE.
Speeds up your phone, removes RAM hogging apps, and makes everything more responsive.
Following this list of apps you can remove, select apps you wish to remove and delete them.
You can either use X-Plore and find the *.apk and associated files from your phone, or use Link2SD to delete them.
IF you wish to restore these apps later, you can ZIP them up using X-Plore (or install 3C Toolbox https://play.google.com/store/apps/details?id=ccc71.at.free or Titanium Backup, etc) to backup these to any MicroSD card first, then delete the app from the phone.
If you forget to backup these files, you can ask in these forums for a copy, or restore you phone to factory original ROM by downloading the original ROM, then flashing it back onto the phone.
Generally, follow the list, be smart, don't delete anything you don't know and you'll be fine.
5. Install your own APPS.
MOVE USER APPS TO SYSTEM SPACE TO FREE UP MORE USER SPACE.
After you install them, you can try and move them from USER space to SYSTEM space using Link2SD.
This works well with most apps, and you'll free up easily 300+MB more space.
For UPDATES to SYSTEM apps, INTEGRATE the updates into SYSTEM using Link2SD. For example, Google Maps and Play Store updates can be integrated into the SYSTEM (updating it), rather than having two copies (one older in system, one newer in user space).
If they don't work afterwards, simply delete them from SYSTEM, reinstall into USER from the Store.
6. Use link2sd to clear the App Cache often. You'll free up lots of useless files from you memory.
7. Optional:
Disable or delete image caching.
Goto \dcim\.thumbnails and either delete all the files there occassionally to free up lots of storage space, or rename the .thumbnail* file to old.thumbail*, then copy in any file (like a small text file or jpg file) and rename to the exact original file name (.thumbail*). This will stop Gallery from caching thumbnails, but will slow down picture browsing.
8. Optional:
Move video/photos to microsd card for the camera.
If you take tons of images, best to install a big MicroSD card, then in the Camera app, under settings, move the storage location to the MicroSD card. That way, precious internal storage space won't be taken up by images/videos.
9. Optional:
Disable all auto-sync that you don't use/need.
eg. Disabling all Google account syncing (settings), you will get a snappier phone w/o all that mindless syncing of data to Google.
If you need to backup data online, you can enable, sync, then disable.
If you don't use syncing, you can delete the apps associated with this and free up even more ram (eg. Google calendar backup,etc).
10. Monitor storage space using Link2SD -> Storage Info, or use 3C Toolbox -> Task Manager.
3C Toolbox lets you drop an icon on your desktop that'll monitor whatever value you wish (ram, storage, etc). It's also good for putting shortcuts on your desktop to do simple things like turn on your camera light so you can use your phone as a flashlight by simply touching that icon.
The MicroSD card method requires you to have a microsd card installed, doesn't let you eject it anytime you wish (if you do, you lose all access to apps stored on the microsd card), and special formatting of the card and modification to your phone. But this method is the only way you can install huge apps in the hundreds of MB to GB.
This method below is not new - many other posts here say parts of this. This is merely the way I did it after reading all the instructions and it works great for me (2/2015 for many months).
37 user apps in user storage, 5 apps moved to system, and still 260 MB user storage free.
(these are keyboards, tools, dictionaries, etc. - not huge storage hogging games).
Generally, this method is good if you only need several dozen useful apps installed for social, web browsing, email, etc, and are not a gamer (games that take up tons of storage), or someone who installs apps endlessly.
A far cry vs the bloated default F6 that almost instantly ran out of space after a few updates.
----
1. TowelRoot your phone to root it.
https://towelroot.com/
Rooting your phone allows you to modify files and such you normally can't.
2. https://play.google.com/store/apps/details?id=com.lonelycatgames.Xplore
X-Plore File manager.
Install this (or any other file manager than can modify root files).
Goto settings, enable SuperUser mode (the last of the three settings), check boxes to see . (dot) hidden folders.
This (or any other file manager than can see system files once rooted) will let you delete apps you don't want.
3. https://play.google.com/store/apps/details?id=com.buak.Link2SD
Link2SD
This program will let you move apps from USER space into SYSTEM space (different parts of storage in your phone). If you move an app you use into SYSTEM space, it frees up user space, letting you install more apps.
Also, you can use this to uninstall both SYSTEM AND USER apps.
4. http://androidforums.com/threads/masterlist-of-safe-to-remove-apps-come-contribute.866390/
DEBLOAT YOUR PHONE OF APPS YOU DON'T NEED OR USE.
Speeds up your phone, removes RAM hogging apps, and makes everything more responsive.
Following this list of apps you can remove, select apps you wish to remove and delete them.
You can either use X-Plore and find the *.apk and associated files from your phone, or use Link2SD to delete them.
IF you wish to restore these apps later, you can ZIP them up using X-Plore (or install 3C Toolbox https://play.google.com/store/apps/details?id=ccc71.at.free or Titanium Backup, etc) to backup these to any MicroSD card first, then delete the app from the phone.
If you forget to backup these files, you can ask in these forums for a copy, or restore you phone to factory original ROM by downloading the original ROM, then flashing it back onto the phone.
Generally, follow the list, be smart, don't delete anything you don't know and you'll be fine.
5. Install your own APPS.
MOVE USER APPS TO SYSTEM SPACE TO FREE UP MORE USER SPACE.
After you install them, you can try and move them from USER space to SYSTEM space using Link2SD.
This works well with most apps, and you'll free up easily 300+MB more space.
For UPDATES to SYSTEM apps, INTEGRATE the updates into SYSTEM using Link2SD. For example, Google Maps and Play Store updates can be integrated into the SYSTEM (updating it), rather than having two copies (one older in system, one newer in user space).
If they don't work afterwards, simply delete them from SYSTEM, reinstall into USER from the Store.
6. Use link2sd to clear the App Cache often. You'll free up lots of useless files from you memory.
7. Optional:
Disable or delete image caching.
Goto \dcim\.thumbnails and either delete all the files there occassionally to free up lots of storage space, or rename the .thumbnail* file to old.thumbail*, then copy in any file (like a small text file or jpg file) and rename to the exact original file name (.thumbail*). This will stop Gallery from caching thumbnails, but will slow down picture browsing.
8. Optional:
Move video/photos to microsd card for the camera.
If you take tons of images, best to install a big MicroSD card, then in the Camera app, under settings, move the storage location to the MicroSD card. That way, precious internal storage space won't be taken up by images/videos.
9. Optional:
Disable all auto-sync that you don't use/need.
eg. Disabling all Google account syncing (settings), you will get a snappier phone w/o all that mindless syncing of data to Google.
If you need to backup data online, you can enable, sync, then disable.
If you don't use syncing, you can delete the apps associated with this and free up even more ram (eg. Google calendar backup,etc).
10. Monitor storage space using Link2SD -> Storage Info, or use 3C Toolbox -> Task Manager.
3C Toolbox lets you drop an icon on your desktop that'll monitor whatever value you wish (ram, storage, etc). It's also good for putting shortcuts on your desktop to do simple things like turn on your camera light so you can use your phone as a flashlight by simply touching that icon.