Restore full connectivity to your Samsung Galaxy S21 5G (G991U) with this 4-piece antenna flex cable set. This replacement kit addresses weak signals, dropped connections, and network instability by providing all necessary components for 5G, Wi-Fi, Bluetooth, and GPS functionality.
When to Replace Your Antenna Flex Cables
Performing other repairs (like battery/screen replacement) that may affect antennas
Experiencing weak or no signal (5G/LTE/Wi-Fi/Bluetooth)
Frequent dropped calls or inconsistent data speeds
Physical or water damage to original antennas Why Antenna Flex Cables Matter
Damaged antennas can cause:
- Slow 5G/LTE speeds
- Unstable Wi-Fi/Bluetooth connections
- GPS signal drops
- NFC payment failures
Step-by-Step Replacement Guide
- Carefully disassemble the back cover
- Remove the battery and old antenna modules
- Install new flex cables in correct positions
- Reassemble and test all connectivity features
Pro Tips
Test functionality before final reassembly
Use magnification for small connectors
Keep screws organized during disassembly
