Can I use the Old Canadian iPhone 5 GSM version A1428 in Hong Kong (please also...

[AlbionKaHei]

...indicate if 4G LTE)? I have the A1428 GSM version of the iPhone 5, brought retail, not the global 1429 GSM version. I was wondering if I can use my phone in HK for:

1. Calling and SMS
2. 3G and 4G LTE

thanks!