1. Re: Family Plans and Adding a Phone. Each line of service on your account has a contract of it's own. So, if you were to purchase a subsidized phone from Verizon, you would have to sign a 2 year contract for the new line.If you paid full retail price or purchased a phone somewhere else, you could add a line without a contract. The cost to add a line to your account would be $9.99 per month.If it is a smartphone, you would also need a data plan for another $30 per month. A text plan is $10 per month for 1000 text or you can have unlimited texting for all lines on your account for $30 per month.If you add a line, there is a one-time activation fee of $35.. Re: Family Plans and Adding a Phone. Each line of service on your account has a contract of it's own. So, if you were to purchase a subsidized phone from Verizon, you would have to sign a 2 year contract for the new line.