You can use this guide to remove the speaker enclosure and its integrated lower antenna.
Tools Needed
* Paper Clip
* Phillips #00 Screwdriver
* Small Flathead Screwdriver
* Spudger
* iPod Opening Tools
Before disassembling your iPhone, be sure the silent switch is activated and your iPhone is powered off.
iPhone 4 Speaker Enclosure - repair manual
iPhone 4 Speaker Enclosure - repair manual
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