Advice on phone bill as student

I’ve taken a year out, I’ve just turned 19 and I start uni in semptember. I work hard balancing two jobs back to back so treated myself to an iPhone 8, it costs £50 a month which I know is ridiculous but I can afford it the moment. When I signed up for it I didn’t think about uni where I won’t have a job and will be living on very little, has anyone else had this problem? It’s a 24 month contract and I’m terrified of either getting into debt or having literally nothing to live on