Chosen Solution
I have iphone 8 plus with the back right corner frame broken and i get really bad signal i did test and when im getting decent signal( 2 to 3 bars) my download speed is normal but my upload speed is super low like .30 to .80 speed I have an iphone 7 plus it works fine no issues with it i think my wifi antenna is affected by the back frame being broke
I can’t see the housing affecting the signal, I think the wifi antenna itself may have got damaged when the incident happened.
