Einleitung
You may need to replace the speaker if you are unable to hear people from the other side of the line consistently. The speaker is glued on to the inside of the phone, so you may need to use a superglue or something similar to reattach the new speaker.
Werkzeuge
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Open up the phone with a metal spudger, sticking it in the bottom near the cord jack entry.
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After unclipping the bottom half of the shell, pull upward from the position shown in the picture to detach the top half of the shell.
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Use the iFixit iOpener to warm the adhesive from the front of the phone, in order to remove the speaker from the face plate safely.
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Abschluss
To reassemble your device, follow these instructions in reverse order.