After replacing Iphone 4S screen, earpiece quiet?

I just replaced a good acquaintance's Iphone 4S screen.
Aside from the proximity sensor, his phone is working, but volume from the earpiece is apparently very low. He describes it as "soft and muffled."

The only reason I could understand it sounding muted
is I used normal cellophone tape to attach the recycled grill. If this is the issue, what would be the proper way to reattach it?

Any input would be appreciated.

I'm assuming it is a bluetooth earpiece.

Did you leave anything out that could have shielded the bluetooth module from the Wi-Fi chipset? In the all iPhones, each operate on 2.4Ghz and can cause interference. Have him try disabling Wi-Fi completely to check.

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