No, swapping SIMs around doesn't mess up anything - I've swapped a couple of SIMs between 3 different phones, just to check on reception difference between providers, and all is fine when doing so.
And yeah, I'm sure those folks(including me) that are interested in this hardware would be interested to see what happens to the call volume on your phone, along with anybody else that may have picked up one of these......
Ok, swapped the sim in and while it's not crazy loud (my huawei is so loud that other folks in the restaurant can hear the caller.... ) it's more than sufficient under normal circumstances. I also checked and verified that the GPS is working using google maps.
Picked up Koodo on the telus network.