[Q] Reset to default APN doesn't work on t-mobile

My wife has a Rogers Optimus G, in Canada. I have a Fido Nexus 4. We both got T-Mobile prepaid SIM cards for use on our frequent visits to the US. The problem I'm having is setting up the T-Mobile APN on the OG.

When I reboot my N4 with the TMobile SIM card in, it automatically sets up the correct APNs.
When my wife reboots her OG with the same TMobile SIM card, the APNs are blank. When I try to Reset APNs to default, nothing happens - the list stays blank. When we reboot the OG with a Canadian (Rogers or Fido) SIM card, it usually sets up the correct APNs on its own. On the rare occasion that it hasn't, Resetting APNs to default has worked.

I can manually create a new APN on her OG, copying the settings from my N4, but it's a tedious process, and moreover, it's not something my wife can really do when I'm not around.

Can anybody think of why this might be happening, or some sort of workaround? I've done a fair bit of searching, but haven't found anything.

She's leaving for Florida on Saturday, a solution before then would be great.

Thanks.

atifsh said:

One option
https://play.google.com/store/apps/details?id=com.riteshsahu.APNBackupRestore

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Thanks, that looked perfect, except for this:

NOTE: Starting with Android 4.0/ICS, 3rd Party apps don't have access to write APN settings, hence this app no longer works for restoring APN backups as a normal app. You can convert it to a System app using Titanium Backup on a rooted phone and use.

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Any other suggestions?