Device(s): Xperia Z1, Nexus 7 3G, HTC One X, SGS3 Mini
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Explorer: All Things Root Guide - updated 16/03/12
*** Important Note ***
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Once you have rooted, it is then possible to install “root only” apps, such as Titanium Backup. TB allows you to remove any apps (including pre-installed carrier apps). It is worth noting that some apps, even if you don’t use/want them, could be used by your system, so it is important not to just start removing apps. Please also note that if it is safe to remove apps for one device, it doesn't necessarily mean that the app is safe to remove for ALL devices. It really depends on the services provided by the app as specified by the particular rom/build. More importantly, system apps are not easily restorable like simply installing an .apk file. And once deleted, even a factory reset will not recover them. You will have to locate and flash a stock rom image to get them back.
One option in TB allows you to freeze apps – I would suggest that you do this initially, as you can always unfreeze the app if you notice that you are experiencing any issues. If, once apps are frozen, your phone is behaving normally, then you can look to removing them. It would be a good idea to freeze apps individually, so that you will notice if each one affects your phone adversely.
It is worth noting that, if you root and install a custom ROM, all the carrier bloatware (which is tied in to the ROM already on your phone) will no longer be on your phone anyway.