Q: Purchase iCloud 50GB monthly USD 1 but device still shows the 5GB standard on my iphone6.

Hey GaryBashir78,

Sorry to hear that you are having issues with your storage upgrade through iCloud. While I see that you have tried at least one important troubleshooting step, you may want to follow some further troubleshooting steps regarding this issue in the article below:

Restart your device

After you sign in to iCloud with the correct Apple ID and review your billing information, you can try these steps to change your storage plan:

1. Leave Settings, and then turn your device off and back on.
2. Sign out of iCloud in Settings > iCloud, and then turn your device off and back on.
3. Sign back in to iCloud.

If you still need help, you can back up your device with iTunes and restore it to factory settings. 

Get help using iCloud storage - Apple Support

https://support.apple.com/en-us/HT203527

Thanks for coming to the Apple Support Communities!