Correct.
CDMA was from the device status page on the Ting website. Regardless, this is going to be my problem - I did not catch this issue. OMG. When I first called their support, they said ‘another customer has your device and is using the [Sprint] C7 SIM card.’ The Sprint C7 SIM itself doesn’t specifically say CDMA on it but it is listed under the CDMA SIM cards on their website. Now when I check the IMEI, it does say GSM on the BYOD page. I have ordered a GSM SIM.
I have done both. The Howard Forums post I linked suggested the generic works best. Doesn’t matter anymore as Ting’s GSM is over T-Mobile’s network.
Thanks again for the help. The GSM SIM should fix my problems. Lesson learned.