I have this horrible looking stock phone app and caller on the galaxy s4 for Verizon. Its a white with black borders. If you refer to the S3 there was a darker color. Reminds me of the windows phones with the the boxes and bad colors. if the attachments showed correctly the darker one if preferred and the other is whats on it now. Im not going to root because my warranty is to much to lose (bad experience) for a few days old phone. Ive looked for a way to change the theme out right. Asking to see if any others had luck. If all else fails I hear dailer one and GO Contacts EX are alternatives, but that also just changes the dailer/contacts. The calling part is also this ugly theme.