What Misc. Files can I safely delete.

I have a LG Android pay as you go Smart phone.

The misc. file is taking up the majority of storage are any of these files listed safe to delete

System Data 1.95GB
LGmTalkSFDB 3.75MB
Kamcord 136KB
positial 92.00KB
Voice Recorder 52.00KB
data 32.00KB
UTSystemConfig 28.00KB
polarisViewer24.00KB
backups 24.00KB
HyprmxShared 16.00KB
Data Storage 16.00KB
.dwnld 12.00KB
.tmp 8.00KB
GDTDOWNLOAD 28.72 MB

OR there are also APPS on here that I never use
in storage there are these options
Apps 693MB
apps 1.33gb
Pictures,videos 3.81
Audio (music, ringtones, podcasts, etc) 444 KB I never download music or listen to podcasts
Downloads 2.09MB
Misc 1.99 GB
AVAILABLE 693 MB
I am trying to figure out how to make delete stuff to get more storage because for some reason my phone is loading really slow. I have one game installed on there and when I play it sometimes it just shuts down and goes to my home page. I am not tech savvy in the slightest so hopefully someone can give me some tips.

 

I don't know what kind of phone other then an Android LG straight talk smartphone . Is there some way I can find out more then that?
Also under storage it says Total Space 3.71 GB and Available 3.67 GB. And what does OS mean?

 

ok nso under about phone it has Hardware info and under that it has model number LGL15G and under android version it has 4.32. as far as it not letting me delete anything thats not safe sometimes I will try to delete something like a music app i have never used and never will used but came with the phone and a message will come up with a message saying something like uninstalling a pre installed app may cause other apps to malfunction. Which doesnt really have to do with MISC. stuff but there are apps on here i will never use that would clear up a lot of space but they came with the phone. I dont know. lol

 

OK now a completely different issue. same phone. I keep not getting text messages. I literally sat next to someone had them send me a message went through fine on there end but did not get to my phone for an hour if at all. I keep getting this pop up that says google apps has stopped or something along those lines. it is locking up. should I reset to defaults and if I do will I lose my contact info. I rather it did not sync up with my email anymore so I do not care if it loses that info. OR better yet should I just buy the IPhone 6 straightalk phone because i want to be able to download at least a game or two and the phone i have now only has 4GB which is 95% used up with no games and the Iphone 6 or whatever it was has 8 GB