phone calls and text only

[wardy_san]

Hello everyone I am brand spanking nee to android os. A family member of mine gave me an at&t s4 but I believe he changed the software on the phone because the start up screen has a picture of an android with a lion on its chest. But anyways when I put my sim card in I can only receive texts and phone cslls. Im using a mac computer. Can anyone point me in the right direction? Thanks in advance

 

[iHackPro]

You should flash the stock ROM and completely wipe the phone. It should be back to a brand new device like it just came out the store then.

How to Unroot Galaxy S4 and Remove Root Completely! | GalaxyS4Root.com

 

[wardy_san]

How would I go about doing that with a mac?

 

[gollum18]

Why don't you give Heimdall a try, it can flash stock firmware back to all galaxy phones and is the open source equivalent to Odin. It runs on all three major platforms Windows, Linux, and Mac OS - [PROGRAM] Heimdall - Open-Source Cross-Platform Flashing Suite (1.3.2 Now Available) - xda-developers