Just bought a used HTC Inspire (previous ATT phone). Now I have a Straight Talk SIM that I inserted into the phone, after taking it out of another phone the mom was using temporarily and tried adjusting the APN settings using the Tweakker app. The app failed to connect my internet and mms. Voice and text are working just fine. I also tried changing APN using this method: "Hook the phone up to a WiFi connection. Set up a google account on the phone if you haven't already. Go to your market. Download APN Backup And Restore. Use that app to backup the existing APN addresses to your SD card(in the event you need to restore it later if you decide to sell the phone). Then delete the APNs(they can interfere with your new ST APN). Go to Settings>Wireless & Networks>Mobile Networks>Access Point Names.....press the menu button on your home row(the appearance and position may vary depending on the phone...consult the user's manual if it's not obvious). You should now have the option to create a new APN. Fill in the following fields(note that this info creates TWO APNs). Do not change the defaults in the other fields. First APN Name HOME APN att.mvno Leave everything else alone EXCEPT the bottom selection that says: APN type (here you must enter the following) default,supl Then save, next choose to add another APN make it look like this: Name MMS APN att.mvno skip down to MMSC http://mmsc.cingular.com MMS proxy proxy.mvno.tracfone.com MMS port 80 skip to: APN type (enter the following) mms THEN SAVE Then select the APN(you won't be able to select the MMS one....this is normal) Then reboot the phone. Done. Note: If you experience issues with MMS use the above info to create just one APN. Just be sure to leave the APN type blank or whatever the default is. Like this..... Name Straight Talk APN att.mvno skip down to MMSC http://mmsc.cingular.com MMS proxy proxy.mvno.tracfone.com MMS port 80 THEN SAVE Then select it and reboot." Nothing is working. I've spent half of my Sunday on this phone, and still do not have data or MMS working. Should I root the phone? I'm out of options at this point.