Q Link Wireless HTC Desire 510; Popping in an already activated Sprint LTE SIM card;

I received a free HTC Desire 510 from Q Link Wireless. Think of it as an Obama Phone. I've been able to unlock the bootloader from HTC, then flashed the latest version of TWRP 3.0.2-0 Have been able to obtain root, flash custom ROM's, kernels & of course most importantly make nandroid backups. Only thing i haven't been able to achieve and that is S-OFF by Sunshine because I am not shelling out $25. Anyways back on subject. It came with a Sprint Micro SIM card and I believe it is only data because I can remove it and still have calls and texts SWIM (someone who isn't me) went to a Sprint store yesterday and found a a working tablet that had LTE connectivity SWIM then secretly popped out the SIM and took it home and switched the Micro SIM Cards and now they get a message in the status bar saying invalid sim/ no service. Another SWIM of mine has an unlocked GSM phone and doesn't pay for their phone bill. Just takes the appropriately sized sim out of the store and pops it and most of the time doesn't even need to changed the APN settings. Any Suggestions for the for the cheap skate leaving well low behind the poverty line. Current ROM I am running is CM12.1 which sadly has tons of bugs, like no camera, random reboots while turning on WIFI and Airplane Mode. Also can someone suggest a custom kernel for CM12.1 with Write Protection Removed? I know this is all over the place and I apologize. It is just a free phone to tinker with until the ONEPLUS 3 comes out with the Soft Gold, hopefully that's the one with the white front. I never dig phones with white fronts but there's something special about it. Can anyone recommend any decent ROM's (because most of them reboot) for this phone along with kernel to go to with it that that has Write Protection Removed. Also in Mobile Network Settings there's an option called CDMA subscription that lets you choose from RUIM/SIM & NV. Any thoughts? One last thing... When I have the original SIM card in under APN settings there's a grip load of APN options, but when i stick in the the other Sprint Micro Sim there are none whatsoever. Ive even tried adding and saving an APN but it doesn't save the APN I remember with the Nexus 5, 6, 5X, t6P and Moto X Pure you could just take an already acitvated SIM card from Srpint and it would would. Any idea

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