Go to PAGE 11, POST #106 to see a simplified method. If this works well, please reply with your results in this thread.

I have had success with my SGS3 (and now my SGS4) in the following places:UK using VodaphoneRome using TIMMorocco using Maroc TelecomRussia using MTCFinland using DNAIndia using VodaphoneNepal using NcellSpain using Movistar and VodafonePortugal using VodafoneChile using Claro and MovistarChina using China Unicoma1 – From Google Play store install the following apps if you do not have them: APN Manager Pro (81 Square), HiAPN Global (install as a system program when it asks), ES File Explorer, Dropbox, Phone Info ( [email protected] ), Titanium Backup and Open Signal Maps.a2 –Backup your phone app: com.android.phone with Titanium Backup. (I suggest you do a full backup of all apps and data as long as you are doing this).a3 – Open HiApn Global and back up APN's to sd card: HiAPN Global>Click to Backup APNs (this will create a file named "apnlist_backup.xml" on your internal SD card at /sdcard/HiDroid_Net/HiAPN).a4 – Open ES File Explorer, then go to menu>settings and check "up to root", "root explorer", "mount file system" and "backup system app". (If you need to get to your external SD card, it is found at /mnt/extSdCard. You can set favorites to get to places you re-visit a lot, and that is a plus to this file management program.)a5 – Using ES File Explorer, navigate to /sdcard/HiDroid_Net/HiAPN and select "apnlist_backup.xml". Copy and rename your file in the same directory as a backup. Now open apnlist_backup.xml with DB Text Editor, and then edit to include your required APN information. For MTS in Russia, I added this line before the last : You may also download the file and edit in Dreamweaver or another appropriate program. You will need to have an entry calledin the edited file, and this number is the combination of your MCC and MNC numbers (250 and 01 would be 20501), but you can just put numeric="" if you do not know the MCC and MNC. If you do not, your HiAPN Global restore will fail in the next step.a6 – Open HiAPN Global>Click To Restore APNs; and allow it to "Clean Original APN Settings" to install all the APN's in your modified apnlist_backup.xml file.Note: If you have any errors in your edited apnlist_backup.xml file, this restore will fail! Go back and carefully look for errors in what you have edited until you get the confirmation that says "Revover Sucess" (The typos are built into the program! It means Recover Success.)a7 – You can optionally use APN Manager Pro>APN List and check that the APN includes your new choices (APN Manager Pro in my SGS3 cannot do anything else or it will crash) and to check to make sure that APN for now is still set to LTE-Verizon Internet or EHRPD – Verizon Internet (they will be highlighted). At his point, your phone should still be fully functional in the US with Verizon LTE.Below are several sites to check if you do not know the correct information. I cannot guarantee that this information is current. What I did is leave the US with several options (for each country I was going to visit) already loaded into the APN file data so I could be ready for several possible providers. You may only need to enter some of this information to get data working (I did not try phone or MMS use). In some cases it may be as little as just the APN Name to display and the correct GPRS APN, while other providers may require the user names or passwords or more for full functionality. Please report your successful requirements in the thread.b1 – turn off phone, pull out battery and put in micro SIM from your foreign country (I was using MTS in Russia and DNA in Finland, but was prepared for several other providers). DON'T LOSE YOUR VERIZON LTE SIM!b2 – turn phone back on and turn off wifib3 – use Phone Info app to change preferred network type "Global" (click on Device Information and scroll down for first box to change). Some have reported that other choices were needed for their providers, so you may have to experiment.b4 – if you need to still edit APN information or cannot find your correct APN repeat