First off I am poor. That being said -- I own a ZTE Z990G (merit?) Android version 2.3.5, running what I believe is Kernel.
I use Groove Ip Pro. I've toyed with all of the settings, experimenting with Troubleshooting, Mic, Speaker, Buffers, Screen Time outs, etc. Uninstall/Clear/Re-install from default settings. But my problem remains. As the call goes on both parties get further and further away (increasing DELAY up to 15-20 seconds). Absolute absurdity. Currently configuring my task/battery apps so that my screen stays active.. I need every little feature/setting that helps--I imagine my processor is to blame? Wifi signal is strong. I use Audio Processing, however with the Synchronize Voice doesnt seem to have any bearing on call quality/delay. Partial Wake Lock and High Perf Wifi Lock are ON, Airplane mode is on to ensure Wifis uninterruption. I've often had issues with no ear-piece sound (calls come from Side speaker next to the F'in mic)- So I use Audio Rerouting + Audio Mode Fallback (I even have a lite app called "earpiece" to ensure in-ear calls. PLEASE HELP..I'm only using this app because I cant afford to pay my phone bill. I'd keep using it if it werent so goddamn inconvenient. Help is appreciated.