Please follow the below steps:
1. If the current location of the network coverage weak, such as in a closed environment like high-speed rail, the network coverage is generally poor, and the internet will be slow.
2. If a metal protective case is used, the network signal will be affected. we recommend you remove the metal protective case or use a plastic or leather protective case.
3. Replace the SIM card and check whether it is caused by the SIM card.
4. Currently, some operator cards have traffic restrictions for the traffic package cards launched by the operator. If it exceeds the carrier's monthly traffic limit, the carrier will limit the Internet access speed of the phone. For details, please consult the carrier to confirm whether the traffic limit is exceeded.