Iphone 6 & 6++ not receiving push notifications - ios

I have developed IOS app and it is published in app store. When i am sending push notification from back end (using php script) only iphone5 & iphone5s users are getting the notification. Both of these phones are having IOS 8 installed.
iphone6 & iphone6+ devices not receiving any push notifications, all my devices are having same ios version 'ios8.1.3'. I also updated iphone6+ to ios 8.2 but nothing.
I have tried various things such as resetting the notification dialogue etc.. but nothing has helped so far.
Is there any solution for this problem.
Thanks in advance.

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Sorry that I add this as an answer but I'm not allowed to add comments yet.
I am also using IOS 9.1 as the deployment target and tested my Notifications and they still work.
I think there are two possible reaons why your notification isn't working:
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If it is the second point you can change it under "Settings>Your-App>Notification>Allow Notifications".
I hope this helps.

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Best,

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