Network says my internet is too weak

How do I change my settings on my iPhone, I guess router? Change to more secure like wspa ? Or one of the other more secure. The directions are too complicated. I have a iPhone 6s . Google and Safari are fitting. Says they aren’t compatible and blocks it I don’t know how the settings are changed but others are too. No one users my phone. I’m sick of it . Just started a. While ago . I prefer Android