I’ve found wonderful gem on android forums:
Just took my A8181 which I got from HK to Softbank after flashing one of the ROMs above, shop people confused for a bit as IMEI wasn’t in their “stock database” but eventually caved in and gave me a sim w/smartphone data plan.
They spent about 30 minutes poking around the phone, comparing it with the plastic model they had in store “hey why it says softbank here and only says HTC on this one??” and had to make a few calls to their boss to confirm. I *think* i heard them mumble “rooted”? once before but I’m not sure the guy was too far.
I’m sure I would have to get a 2 year contract with a useless phone otherwise, just to use it’s sim.
Looks like there’s hope to get imported phones to work legally in SB network.