Effective problem solving

i hear my children talk this morning:

Walter (10): ‘Noëmi, I don’t know what happened, my mobile phone won’t work – can you fix it, please?’

Noëmi (14): ‘Ok, let me see… ready, here you are. It was quite simple – even mama would have been able to fix it. So may I ask you to next time check with her first, and only if there is a real tech problem, come to me?’