Why is my on call speaker option is disabled after IOS 11.3.1 upgrade?
I got my screen replaced by local vendor and then upgraded the phone after couple of days... since then my on call speaker function isn't working.
On my experience this is what you can do:
1. Restore to factory setting via iTunes. if still fail then,
2. If you can test another proximity sensor. if still fail then,
3. You will have the next issue.
- Faulty soldering on the Audio IC chip and this can be fixed by the jumper wire - reball method.
A somewhat difficult task if you are not familiar with this type of repair level.
I have fixed 5 phones with this exact same issue, already fixed.
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