[Verizon Samsung Galaxy S III] Mix3d:
Easier Global Mode Tutorial

Hey Guys, as a Cheap B*stard who wanted to use his phone in China and not pay for apps or a new phone, I found that many of these steps were a little unnecessary, and the preparation steps not needed unless you wont have Wifi in your country destination. And I can confirm that HiAPN does in fact work splendidly, despite being a sketchy Chinese app. If I reference a Paid app, I didn't use it, but it might make things easier for you.

Instructions using only HiAPN Global:

Root Phone

Install HiAPN Global

it will ask to install itself as root due to the v4+ inability for market apps to change APN settings. Say yes.

Note: At this point, if you put in your new SIM and reboot, HiAPN may launch and suggest the right settings for you automagically. I can't confirm this but it happened to me when I got my actual SIM, after borrowing a friends to make sure it would work

Backup your APN settings if you are on custom rom or OCD about this, but the Stock rom has built-in restore settings (more on this later)

Tap "Click to ManSet APNs" and select your carrier recognized by the SIM.

If your APN settings aren't there, too bad, I havent tested it elsewhere. Check alternative methods below.

Change to global mode if you haven't already.

If you were a derp like me and turned off mobile data for fear of roaming charges, turn it back on (if you bought data on your new sim card anyways)

Reset for good measure

Feel free to confirm the APN settings stuck in Settings/More/Mobile networks/Access Point Names

You should now be Global. Celebrate. :highfive:

The phone might complain about a non-supported SIM, so either forceclose the "Setup Wizard" app after every reboot, or freeze it with Titanium pro to get rid of the notification. (or get rid of the app however you want, like renaming the APK or something. No guarantees here though)

Before I get Q's, yes, data, voice, SMS and MMS work, using China Unicom. I cannot confirm HSPA+, but if that means the H+ icon shows where 3G is normally, then I'm getting that too. Otherwise, 6753kbps down and 71 up, according to speedtest.net. (which wasted a good 10MB of my measly 60MB a month. I did it for you guys)

Actually, I didnt check MMS yet, but I neither expected to need it nor really care anyways. You're on your own

If HiAPN doesnt have your settings, try:

"Offline SIM APN"

It will complain about not being a system app, so either use Titanium pro, or do it yourself (Move the apk to /system/app and change permissions; google it).

Tap the Search APN settings button and select your carrier if recognized.

If the app was moved to a System app properly, it should be able to apply the settings it pulls up when you press the Add these Settings button. If not, at least you have your correct settings for the next step.

If that STILL doesn't work in your unknown country in the middle of nowhere:

Follow the OP to backup APN settings with HiAPN, edit the XML manually with your known settings, and restore the edited backup to insert your new APN like a sneaky virus hacking your cell's DNA.

To revert back when you return:

in Settings/More/Mobile networks/Access Point Names, press menu button - Reset to Default.

Verizon settings now restored. Pop back in your SIM before or after, not totally important the order.

If you really don't want to keep root for whatever reason, follow those OP instructions too. (But root is awesome, so why bother.)

Props to the community for making this happen.