It could be also she did not have her cell phone service up to date. I put in a code each month into my cell phone so that I know that I am getting the lastest/updated calling areas available. I have to do it for my husband also as he barely know how to use his cell phone even with me trying to show him time and time again how to.
On Verizon I believe it is *22 to upgrade/reprogram your phone for the current calling area.
I thought Verizon was *228???