Unlocked iPhone 4s swapping SIMs - iOS 5 worked, iOS 6 doesn't

Situation:
- Factory unlocked iPhone 4s
- I swap between Rogers and StraightTalk SIM chips as I cross the US/Canada border twice a week
- I install the StraightTalk APN profile when plugging in the StraightTalk SIM
- I remove the StraightTalk APN profile when plugging in the Rogers SIM
This worked perfectly in iOS 5.1.1
Under iOS 6, this doesn't. Either direction. (Multiple attempts to confirm I wasn't going mad.)
Only Resetting Network Settings is successful. (And doing so also resets iMessage settings, bahh!)
Several things I've tried, all with no avail:
- Turning it off and on again/rebooting
- Actually installing a Roger APN profile
- Airplane mode on/off
Not fatal, but annoying.

6.0.1 seemed to fix the iMessage problem (it no longer reverted to sending from my phone #.)
But this problem still exists in 6.0.1. Swapping the SIM in a Factory Unlocked iOS 6 phone requires resetting of Network Settings to work.
iOS 5 worked fine.
Sigh.
Any one with any ideas?

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