Originally Posted by repairsuniverse
We see this sometimes when people are repairing their phones. This is often caused by adhesive covering the clear hole on the digitizer that the proximity sensor "sees" through. Make sure the sensor is not blocked and your issue should be resolved.
I resolved the issue with the proximity sensor but the phone still only works on speaker or with bluetooth. The button tones work fine so I know the speaker is working. I also double-checked the connections and everything seems to be in order. Any other ideas?