Hi Steve. OK, I'll answer all your points here on list rather than replying privately to you, this for the benefit of everyone. Firstly, the phone I use, the E71 doesn't incorporate a built in GPS receiver. It does have AGPS, but you can't use both internal AGPS and external receiver together at least not with Wayfinder. Secondly, its not so much the 66 channels that interests me as I'm sure the lock will be as good if not better than the keychain receiver. What decided me on buying this receiver is primarily the AGPS function built in to the receiver itself, decreasing cold boot time by half and triangulating my position until I get a more solid and accurate fix with the satellites. Remember, the AGPS function is useless on my phone unless I want to use it as my primary gps receiver with wayfinder which wouldn't be too accurate *smile*. All the best, Ibrahim.