Hi, I recently bought a Nexus 5 from google to replace my GS2 X. I kept my old sim card (1 year old, prepaid, pink/purple on white, the 0000s on serial number) that I cut into a micro sim. However, I noticed I couldn't connect on the LTE network. The koodo sales rep at the counter was absolutely no help and didn't know the difference between HSPA and LTE. She called and the technical support said it couldn't possibly be the SIM card. My friend has a GS3 on prepaid (same as me) and we tried switching our SIM. I got on LTE and he fell back on HSPA+. So I guess the problem is really the SIM huh? Or, like I saw it happened on AT&T, my SIM card was activated with a GS2 IMEI and the network is forcing HSPA+ since the GS2 was not LTE compatible?