I’m not sure how long your mum has been in the care home, but I would say my mum took about 5 weeks to settle in. Whenever I visited she would beg me to let her go home, crying. It was heartbreaking, but it was unsafe for her to go back home after several falls and then leaving the grill on all night. We found her slumped over her bed semi unconscious, However, then she started to thrive with good food, good company and good care, She made friends and things slowly improved. She was there until she passed away 2 years later. I feel that phone needs to be removed for your sake as well as your mums.
My aunt also recently went into a care home but she didn’t settle and became aggressive, rude and violent to the carers and other residents and the care home wanted her gone. My cousins cared for her in turn at her home and eventually booked 24 hour carers to live with my aunt, and that was ok and was well tolerated by my aunt. However this was private and I don’t think this service is provided by Social Services. I do hope your mum settles in soon, 💗