![ATTENTION: Samsung Updates required to use VoLTE network on eligible devices. - Illinois Valley Cellular ATTENTION: Samsung Updates required to use VoLTE network on eligible devices. - Illinois Valley Cellular](https://i0.wp.com/www.ivcel.com/wp-content/uploads/2023/01/Galaxy_S21_Plus_Black_Front_CMYK.webp?fit=280%2C280&ssl=1)
ATTENTION: Samsung Updates required to use VoLTE network on eligible devices. - Illinois Valley Cellular
![Amazon.com: Samsung Galaxy S21 5G (128GB, 8GB) 6.2" AMOLED 120Hz, Snapdragon 888, Global 5G Volte Fully Unlocked (AT&T, Verizon, T-Mobile, Global) G991U1 (w/ 25W Charge Cube & Fast Wireless Charger, Gray) : Amazon.com: Samsung Galaxy S21 5G (128GB, 8GB) 6.2" AMOLED 120Hz, Snapdragon 888, Global 5G Volte Fully Unlocked (AT&T, Verizon, T-Mobile, Global) G991U1 (w/ 25W Charge Cube & Fast Wireless Charger, Gray) :](https://m.media-amazon.com/images/I/51SUZRmZzOL.jpg)
Amazon.com: Samsung Galaxy S21 5G (128GB, 8GB) 6.2" AMOLED 120Hz, Snapdragon 888, Global 5G Volte Fully Unlocked (AT&T, Verizon, T-Mobile, Global) G991U1 (w/ 25W Charge Cube & Fast Wireless Charger, Gray) :
![Do NOT update to One UI 4 on Samsung S21, if your carrier relies on VoLTE and wifi calling exclusively for phone calls, SMS(May affect other models too) : r/samsung Do NOT update to One UI 4 on Samsung S21, if your carrier relies on VoLTE and wifi calling exclusively for phone calls, SMS(May affect other models too) : r/samsung](https://i.imgur.com/nF5jdvT.jpg)
Do NOT update to One UI 4 on Samsung S21, if your carrier relies on VoLTE and wifi calling exclusively for phone calls, SMS(May affect other models too) : r/samsung
![Amazon.com: SAMSUNG Galaxy S21 5G (128GB, 8GB RAM) 6.2" AMOLED 2X, Snapdragon 888, 64MP Camera, Volte Fully Unlocked (AT&T, Verizon, T-Mobile, Global) G991U1 (w/Fast Car Charger, Gray)(Renewed) : Cell Phones & Accessories Amazon.com: SAMSUNG Galaxy S21 5G (128GB, 8GB RAM) 6.2" AMOLED 2X, Snapdragon 888, 64MP Camera, Volte Fully Unlocked (AT&T, Verizon, T-Mobile, Global) G991U1 (w/Fast Car Charger, Gray)(Renewed) : Cell Phones & Accessories](https://m.media-amazon.com/images/I/61jYjeuNUnL.jpg)