Hello, i have that little ''H'' up besides the wifi icon, and is stay there when mobile data is on or off,And I want to dissapear but i don`t know how.Please help me
This is normal. As long as it stays greyed out it will use the wifi signal. It will only use H (HSPA) when an MMS message (picture/video) is used via text message.
Unfortunately with some carriers this won't happen. You can see if you have a Caller ID app (and disable it) as sometimes that causes it to stay but some have reported this still doesn't get rid of it.