I have an application that require the GSM/CDMA radio to be present and the ability to read the devices' IMEI (which is not present on WiFi-only devices).
How would I use the <uses-feature> to restrict my app from being visible to WiFi only devices on Play?
Right now I have this in my manifest:
<uses-feature
android:name="android.hardware.telephony.gsm"
android:required="true" />
Should I also add android.hardware.telephony.cdma to allow the app to be installed on devices using GSM and CDMA as well?
Use android.hardware.telephony instead. Otherwise you require a specific type of telephony, which may not be available. And if you required both CDMA and GSM you'd end up only working on a very small set of phones that have both.
Please note that CDMA doesn't have an IMEI, it has its own identifiers.