I have just switched over from Ting CDMA to Ting GSM, using a Noika 920 (windows phone). Everything went smoothly except when I attempt to enable "Internet Sharing" I'm told that it's not supported by my plan and directed to T-Mobile support. I opened a ticket with Ting and as of this morning have been told that direct tethering is not available to Ting GSM. This I found quite shocking since before making the switch I do believe I read every forum and blog post on this subject and nowhere did I see any mention that tethering is not supported.
So, I'm looking for validation of this from the community. I'm a bit upset here and feel very much let down by Ting. If tethering isn't supported on their GSM service I really feel they should have said so.