Please how can I upgrade my iPhone 6

To update to the maximum of iOS 12.5.7, please see: Update your iPhone, iPad, or iPod touch - Apple Support

And: If your iPhone, iPad, or iPod touch won't update - Apple Support

If the above Apple articles do not help, please post back with relevant information. 

assiam98 Said:

"Please I want to update my iPhone 6"

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"Upgrading" and iPhone 6:

How exactly are your looking upgrade? If internal storage, read the following...

Upgrading an iPhone Internal Storage:

Internal storage cannot be upgraded. It is what it is. So, the maximum internal storage capacity never increases, even if you upgraded your iCloud plan.

So, what to do:

Find out on my two user tips:

• How to Clear Space from your Mobile Device, and What to Clear: - User Tip
• How to Clear "Other" in your iPhone's Storage - Use Backup - User Tip