I Used a nokia 6230i for over a year , the back cover is the worst i ever saw , it doesn’t open at all

The manual wasn’t helpfull , i searched thet and found this

Some of Nokia’s phones back covers can be extremely difficult to open, and the process of opening is badly documented in the manual.

[WikiHow]

and now i have been trying for 45 minute to open this cover becase i want to remove the Sim Card to my new mobile and it wouldn’t open , i’m thinking of using a hammer right now