I am in San Fran now and I have my Sierra 754S aka AT&T Elevate. I popped in an AT&T microSIM from my iPad (which I activated a day earlier) which I taped back onto the SIM cutout since the device takes SIM not microSIM cards.
Other than the fact that one of the SIM socket pins was bent back (I guess I did this trying to get at the SIM card slot as I kind of forced it) the device was a breeze to get up and running. I have three devices connected to it right now - a laptop, iPad and Blackberry. The display says that the device is 4G and looking into the detailed screens the current radio band is WCDMA 1900 and the service type is HSPA_PLUS.
Internet speeds are not great at about 1-1.5Mbps down and about 0.7Mbps up but I have found that I have always had issues with AT&Ts speeds when I go to the US as I generally travel to San Fran and NY and both of those cities are known for being saturated due to high volumes of wireless device usage, especially iPhones.
This device was initially configured for AT&T. When I come back to Canada and pop in either my iPad or BB SIM and create a Rogers profile what is the APN setting?
Is the correct APN setting to use: rogers-core-appl1.apn ?
Hopefully the device is unlocked as advertised.
If I find an AT&T store then I may try to get a LTE SIM. But I may not use it on this trip unless they will let me transfer the $50/5GB plan from the iPad to an LTE SIM. But $50 for 5GB is pretty good compared to what you pay to Rogers for roaming, even with their roaming plans. So far I have spend $210 ($160 for hardware + $50 for a data plan) but hopefully I will save a fair bit on roaming and I already save $26 is not paying for 2 days hotel internet at $12.95/day.