To increase capacity of storage ????

Increasing capacity is not possible with an existing device. You only have the option of acquiring additional capacity by purchasing a device which has a greater capacity.

Deukaij Said:

"To increase capacity of storage ????"

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Actually, you could rid of any files you do not need. Such files may be media files. A full movie is Typically 2-3GB in size. So, in a manor of speaking, yes you can increase your iPhone capacity! Though, not officially so.