Conclusion
It is difficult to determine the best smartphone under $400 as it depends on your personal needs and preferences. Some factors to consider when choosing a smartphone in this price range include the processor, battery life, display size, camera quality, and storage capacity.
Some popular options in this price range include the iPhone SE, Motorola One 5G Ace, Honor 9X, and Xiaomi Redmi Note 9 Pro. The iPhone SE is a good choice for those who want a powerful processor and a compact size, while the Motorola One 5G Ace is a good option for those who want a 5G phone on a budget. The Honor 9X is a good choice for those who want a large display and expandable storage, while the Xiaomi Redmi Note 9 Pro is a good option for those who want a phone with good performance and a large battery.
Ultimately, the best smartphone under $400 for you will depend on your specific needs and preferences. It may be helpful to do some research and read reviews to find a phone that meets your needs and fits your budget.