Unlocked Sprint S4 Strangeness topic

I have a Unlocked my Sprint S4 by instructions on this forum and been using it on Straight Talk for months. Just recently found out some oddities:

1. I can send but cannot receive picture messages. I have checked and rechecked the APN settings. even deleting everything, re-entering the settings and restarting the phone.


2. The phone number listed in Settings > More > About Device > Status is the previous owner in California.


3. #2 is not that big of a deal except that the voice mail button on the dialing pad calls that number, not my own number to check messages. (I got around this by using Google Voice.)


4. Possibly related to #2 is when I send group text messages, the recipients get the message as if it was sent from the previous owner's California number.

How can I solve at least #1 and #4?