[eri T]

i have two questions to ask first is, any time i use my wifi connection my yahoo account works perfectly but when i use my data connection my yahoo account don't work?
second is, my phone htc touch pro2 some times like 3 to 4 times a day it goes to align screen and locks everything the only way for me to get around this is by taking the battery off and then on so is there anything that i can to fix this.