Default [Q] Disconnected HTC EVO

I have an old Sprint HTC Evo , rooted and loaded with custom rom, I had used the wi fi tethering on the Evo while it had sprint service. I have now switched to a different phone . the old Evo still shows it has full 4g signal strength on it but i am unable to tether or browse the android play store. I was wondering if it is at all possible to tether on the old disconnected HTC EVO.