If an inmate and his celly assaulted co's to destroy a phone what would the consequences of that be and how much more time can they get for that? For a Cali state prison level 3 B yard??

If you are saying your inmate assaulted a guard to keep him from finding their hidden cellphone, they have a huge problem. Cell phone possession by an inmate carries a five-year federal charge. They do not often up the charges, they usually throw the inmate in the SHU for 6 months to a year then transfer them to a higher security facility. But, the assault of an officer changes everything.