I have been using Samsung Galaxy ACE NXT (which is also known as Samsung Galaxy V in some regions) for the last 3 months. It is an entry level smartphone with 3G, Dual Sim, and Android 4.4.

The worst thing about Samsung is the bloatware they install for users, I believe. Applications like ChatON, CloudSync, Talkback are useless to me. Plus I am a minimal user who prefers Android with only Google Play Service, nothing else. So I recently rooted my phone and uninstalled all the bloatwares that seem useless to me. It left my system an extra 250MB space. My system is completely functional till now. So it should work for you too. But please be warned. Uninstall them on your own risk and don't forget to make a backup.

Here is the list of bloatwares.

AccuweatherPhoneMass2014.system.apk
BasicDreams.system.apk
Books.system.apk
ChatON_STUB.system.apk
ChromeWithBrowser.system.apk
DeviceTest.system.apk
DiagMonAgent.system.apk
Drive.system.apk
FotaClient.system.apk
Gmail2.system.apk
GMS_Maps.system.apk
GoogleCalendarSyncAdapter.system.apk
GoogleContactsSyncAdapter.system.apk
GoogleTTS.system.apk
Hangouts.system.apk
HybridRadio_ESS.system.apk
Magazines.system.apk
MediaUploader.system.apk
MobileTrackerEngineTwo.system.apk
Music2.system.apk
MusicCommonUtility.system.apk
MusicFX.system.apk
OmaCP.system.apk
PlayGames.system.apk
PlusOne.system.apk
SamsungApps_hdpi.system.apk
SamsungIME.system.apk
Samsungservice2_hdpi.system.apk
SamsungTTS.system.apk
sCloudBackupApp.system.apk
sCloudDataRelay.system.apk
sCloudDataSync.system.apk
sCloudQuotaApp.system.apk
sCloudSyncCalendar.system.apk
sCloudSyncContacts.system.apk
sCloudSyncMemo.system.apk
sCloudSyncSNote3.system.apk
SecEmail_ESS.system.apk
SecExchange_ESS.system.apk
SecLiveWallpapersPicker.system.apk
SecVideo_ESS.system.apk
SecVideoPlayer_ESS2.system.apk
SharedStorageBackup.system.apk
SPPPushClient_Prod.system.apk
SPrintSpooler.system.apk
Street.system.apk
SyncmlDM.system.apk
talkback.system.apk
UserDictionaryProvider.system.apk
Velvet.system.apk
Videos.system.apk
VoiceRecorder_ESS.system.apk
WebManual.system.apk
YouTube.system.apk

To root SM-G313HZ, check my post Root Samsung Galaxy ACE NXT (SM-G313HZ).