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My Girlfriends' iPhone 5 loudspeaker was broken. Since she usually uses speakerphone when on the phone, that had to change!
The repair went well, The biggest problem is how tiny those screws are. My fingers aren't what you'd call dainty...
Get a good magnet mat. Maybe one that has small raised divisions (or make it yourself) keeping the screws straight was by far the hardest part. Plenty of light is also good. The spudger is a must, and patience...