My apple store keeps saying cannot connect to apple store every time I go in can you please help me.

Me to I can go to apple store but if I want to download any apps he keeps telling me that you should increase your balance in your phone. App is free help me

I can’t download anything from appstore last 2 weeks. What is going on guys?????

If you can't connect to the iTunes Store, iBooks Store, or App Store - Apple Support