cost to add a line to verizon wireless
Report Abuse. I just added my sister in law to our verizon wireless account. To add a line-it costs $9.99 per month. However, my sister in law (and I'm sure your son) probably wants text messaging.Text messaging adds anywhere from 10 to 20 dollars a month onto your cell phone bill.eport Abuse. I just added my sister in law to our verizon wireless account. To add a line-it costs $9.99 per month. However, my sister in law (and I'm sure your son) probably wants text messaging.