Does my husband who is in prison have access to the internet

No, absolutely not. However, there are inmates that have illegally obtained smartphones and can get access for a brief time. Inmates caught with a cell phone are subject to harsh disciplinary actions including loss of all privileges (commissary, telephone, visitation and possibly freedom because they will certainly spend the next 6-12 months in segregation in the SHU). There is a chance the inmate will catch another charge which could add upto another FIVE YEARS to their sentence, plus they are going to get trnsferred to a more strict custody-level prison above the level they are currently in.