Call Recorder by Skvalex works 100% of the time for incoming and outgoing calls and uses the line (not the speaker) for recording. I have tried numerous call recording applications, but this is the only
one that works for the Samsung Galaxy S Relay 4G (SGH-T699). This will require root
1) Install https://play.google.com/store/apps/d...x.callrecorder
(costs $10, or test it first using the time-limited trial from http://forum.xda-developers.com/showpost.php?p=21317161
2) In the application, click the Menu button, go to Settings > Recording > Device menu, select the Qualcomm MSM8960
In the future, our phone's model may be put in this list for convenience, but choosing the chipset is anyway functionally equivalent.
the "Delay before start recording" for Incoming