A: Dial *#2263# (Samsung band selection), choose “LTE Band Selection,” and select all LTE bands. Or go to Settings → Connections → Mobile Networks → Network Mode → Choose “LTE only” (if available in your carrier firmware).

Before diving into the specifics of your SAMSUNG Galaxy A51, it's essential to understand the basics of 3G and 4G networks. The third generation (3G) of wireless mobile telecommunications technology provides a faster data transfer rate compared to its predecessors. However, with the advent of 4G (fourth generation) networks, mobile internet speeds have increased significantly, offering a more seamless and efficient browsing experience.

Thus, the real question is not “3G or 4G” but rather

A: No. You cannot upgrade hardware. However, your Galaxy A51 is already 4G. If you are seeing 3G, follow the troubleshooting in section 9 above.