COVID 19 Vaccine Signup Please call GLFHC's COVID Vaccine Call Center at 978-686-6029 or click below for online scheduling. If no online appointments are available, call 978-686-6029. Bring your vaccination card with you when coming to one of the sites. Llame GLFHC's Centro de llamadas para la vacunas del COVID al 978-686-6029 o haga un.