Forgive my mobile ignorance. I have a Galaxy S4 from Verizon (sch-i545), and I do not use it as a phone anymore. What I want to do is turn it into basically a very simple media device for kids' use on wifi at home. Almost a tablet. I want a very clean version of Android, and I will install a very few number apps, just a few carefully-selected things that my children can use.
If I root the phone and then install a custom ROM (I haven't done this yet but see plenty of tutorials online), will I be able to achieve what I want, or will my phone keep complaining about not having a SIM card? And will it still think it is associated with Verizon (custom splash screen and who-knows-what-else)?
Certainly, I could just factory reset it and disable the dozens of bloatware apps, but I'd feel especially content to do a little more than that and have the knowledge that it's just a little computer running the custom android version I want without any Verizon fingerprints upon it.