Photon use overseas
August 14-21 I was in Copenhagen, with a layover in London
September 15-27 I was in Johannesburg, South Africa with a layover in London.
The Sprint SIM shipped with the card did work in Copenhagen and London, but would not register with a GSM network in Johannesburg (It could find them, but wouldn't register, so is probably a carrier agreement issue). I chose not to use it because it was expensive as heck (and personal).
In London, I tried a Verizon/Vodaphone sim - Got voice and data.
In London, I tried an ATT aircard SIM: got data (voice via skype).
In Copenhagen, I used the Verizon/Vodaphone sim, but got spotty data. Using that same sim in the original BB produced the same results (spotty data), so it might be a carrier access issue.
In Johannesburg, I purchased a pre-paid SIM from MTN. Voice worked out of the box, but I had to manually enter the APN info (deleting the proxy) to get data to work.
DATA DID WORK WITH A PRE-PAID SIM.