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how to reset the usage ...hmm specially how to change the date of start and end
any idea?the start date written (7/14)i want it to be(7/22)(today) 
Settings > Data usage > Click the date range (for example 2 jul - 1 aug) > change cycle
yes i cant find the range i want i cant modify it manually?by entering the start day? highest range written is 4 Jul-3Aug but its too early so i wanna change it
Unfortunately it's not possible to change to anything else. There might be 3rd party apps where you can change this.
This has been asked before:
/t5/Other-Discussions-General/resetting-data-usage-in-xperia-z/m-p/1006601#M7884
/t5/Xperia-Z2/data-usage-problem/m-p/1010825#M30424
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