Hi I just got a new Iphone SE so,When i tried to download some apps the apps don't download.I tried to download some apps but it doesn't work may you help me?!

See the Apple Support article(s) below.

Apps won’t downloaded.       

App Store, iTunes Store, or other Apple services - If you can't connect

Some things you can try. Do you have access to another WiFi network where you can try? That has worked for several people.

Try a restart.

Restart your iPhone, iPad, or iPod touch         

Try a forced restart.

Reset Device.      

If necessary

Hard reset.        

Do a backup and try a factory reset. Then restore from your backup.

Restore to Factory setting.      

Backup - Restore your device from an iCloud or iTunes backup.