I live in Bangladesh and use Grammer phone internet outside my house. Recently I installed the Reddit app on my android phone. I installed it in my house and used it without any issue.
When I got outside and turned my data, I found out that I can no longer use Reddit. I tried different ways including the classic restart technique.
Then I thought of changing my DNS on my android phone. After changing the DNS it worked perfectly. To change DNS, first you have to go connection and sharing from setting.
The go to PRIVATE DNS
Then select Designated Private DNS and enter as the following image.
Now save by clicking the tick mark on top. Your DNS is changed.