I'm still working on the zn4 so far no luck but for the a455 rival on page plus follow these steps:
1. Power on the phone
2. Dial ##BROWSER (##2769737) and press Talk (SEND)
3. With VWZ Highlighted Select Options
4. Select Copy Entry and rename the new file PPC
5. Select the newly created PPC file, press Options, and Select EDIT
6. Change the following entries to these values:
Name: PPC
Homepage: [Only registered and activated users can see links. ]
Used ID: MIN
Password: vzw
Gateway IP 1: 000.000.000.000
Gateway 1: ppcgw1.vzwreseller.com
Service Type: HTTP
Port 1: 8080
E2E Port 1: 8080
LXL Port 1: 443
Gateway IP 2: 000.000.000.000
Gateway 2pcgw2.vzwreseller.com
Service Type 2: HTTP
Port 2: 8080
E2E Port 2: 8080
LXL Port 2: 443
Cache Start-Up: off
7: Click Save
8: Click Options with Ppc highlighted and Select Set As Default
9: Power Cycle Phone (power off then on)
Your phone should now be able to use MMS and Mobile Web
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