Naomi has a friend who can't seem to get Internet access with her mobile phone. Leo says if she doesn't have good cell access in her home, then she should ask her carrier for a Femtocel that she can connect to. It basically uses the internet to make phone calls. But she'll have to have a separate internet connection to take advantage of it.
Another option is a signal amplifier. Naomi can check out WilsonAmplifiers.com for the WeBoost. It'll boost her cell signal from where it's best to where it's worst.
She may need to check coverage maps to find the best carrier for her location.