AT&T on $5 a day

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I have a friend who freelances as a research assistant for a tv writer. Only couple days a month on irregular schedule. She finds herself on location where there is often no public wifi or it is too far away to keep going back and forth. Paying piece meal for internet would suit her just fine since she gets paid cash. Does not have the money for or want to spring for a monthly data plan. At home, she shares service with the mcdonalds next door.