We're sorry to hear that your husband is experiencing issues with his device. All of our new phones have a 1-Year Warranty if you are past the 7-Day return policy.
Yes. I've learned my lesson with this, and bought a phone that isn't locked to a carrier, and uses Android One, so I get regular monthly updates for my stock android device. I no longer have wi-fi calling, but that was so hit-or-miss when I DID have it, that I don't miss it at all. Also, my new Nokia 6.1 has much better antennas and/or signal reception than the Pulsemix. I downloaded the MyCricket and Cricket Visual Voicemail apps, after installing the SIM from the Pulsemix into the handy little slide-out tray of the Nokia and letting the phone set itself up for Cricket near automatically.
I still have the Pulsemix, and strangely, without the SIM card, it no longer has battery drainage problems, and works fine as an ersatz... er... droidpod?... wifi connected media player and app running device.
I kind of imagine the software support team for these near free devices as two guys locked in a closet, who are responsible for an entire line of devices from flagships on down, so freebie/low cost devices are so low on the "to-do" list for these guys that we'll never see an update to fix this for months, or years. Lack of support is the REAL price for cheap devices and service, so I can't really complain when this stuff happens, since I should factor in that it WILL happen, when I go for the cheapest option.