Bell and Telus’ massive, sudden addition of nationwide HSPA networks to succeed their legacy CDMA towers was an experiment unlike anything the wireless world had ever seen; at no other time had carriers that large jumped from one 3G technology to another, and it was anyone’s guess how well it’d go and what effect it’d have on their bottom line — clean-slate network build-outs aren’t cheap, after all. We’ve got part of that answer now that Bell has reported fourth quarter earnings, and in a nutshell, it seems like this may have a huge gamble that paid off.

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Bell scores 163K net adds in Q4, has HSPA launch to thank