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You see that the 3G wave column, Wifi is still stretched, but the network is too slow, it depends on the network connection speed you are using, if you are using Oppo device, do the following to enable network speed display for Oppo.

The network speed display feature for Oppo is very interesting, you can know exactly how fast you are accessing the network, not only 3G but also Wifi, you will not need to test the network and be more active in using, like the battery percentage indicator function. For Android users, see more articles on how to enable TalkBack mode on Android

Enable network speed display for Oppo

Step 1: Access Settings on your Oppo phone.

Step 2: Select the Display section .

Step 3: Here you will see the Show network speed feature, click to open it.

https://Software/kich-hoat-tinh-nang-hien-thi-toc-do-mang-cho-oppo-2835n.aspx
So through this article we have shown you how to enable the network speed display feature for Oppo, a very convenient feature that not all phone companies have, or need to download 3rd party applications to have this function. If you cannot use the above method for other phone companies, please apply the network speed test trick on your Smartphone