I just got an Alcatel LINKZONE to replace my ZTE, and I put the SIM from the ZTE into it. I can connect to the LINKZONE, but when I do speedtests it shows download speeds in the kilobyte range, usually about 40-50 Kilobytes, but the upload speeds are in the Megabyte range, usually 7-8 Megabytes. What can cause this? Is it something related to the old SIM? Do I need to use the SIM that came with the replacement, and if so, how is the account set up? Normally I wouldn't mind having such high upload speeds, but only if I get high download speeds as well.