You have to go to each person you're following & enable each person for mobile notification.
Hope this help.
Good Luck
This is only if you want to be notified EVERY TIME THEY TWEET. Most sane people will not want that unless you only follow a few family members. Otherwise it adds up quick—say you follow 100 people who tweet 10 times a day...if you enable everyone's personal notification setting you'll have a thousand alerts per day.
Thanks for all the help! Just following a few for business. Nice job TurboTiger!