Who I have the same questioned this topic

Hello,

I have a Sirin Labs Finney phone, and the user guide says its compatible with CDMA and GSM. I put my SIM card in and the data works fine, but no voice or text. I tried to register the IMEI and it returns not recognized. I believe the IMEI just needs to be added to the database. 

Specifications of the phone can be found here: https://userguide.sirinlabs.com/#finney-product-specifications-cellular-and-wireless-connectivity