I know nothing about cell phones. I am graduating from a phone that has the slide out key board. Bought an AT&T LG Thrill 4G and found out it is out dated, extremely slow and the battery is crap. I need a pay as you go, to go with my Airvoice STANDARD sim card, that is new, 4G, preferably an 8 memory, good battery life and is kind to an old lady who is computer savvy, just not cellphone savvy. Please help.