To show the Ask Line on Mobile Devices, please follow the below steps:
iOS Devices:
To enable the Ask Line on an iOS MT4 Platform:
Go to Settings.
Click on Charts.
Slide the button next to the Ask Price Line to turn it on.
Note: You can use the same button to switch it off as well.
Android Devices:
MT4
To enable the Ask Line on an Android MT4 Platform:
Go to Settings.
click on Charts.
Check the box for Ask Price Line to turn it on.
Note: Unchecking this box will turn it off.