Cellular data....really weird behavior.

Hello,
I've got a problem using my cellular data connection on my iPhone 5 64gb with last updates. I ve got a data plan with 3 ITA and everythings worked good in the last months...then i moved to london for a while (and used a uk sim) and when i come back and try to use my connection with my 3 ITA plan i noticed a really weird behavior.:
Only whatsapp works....and sometimes facebook messanger notification (but no way to send messages)....or maybe a push notification from the email sometimes. But for example safari or chrome never works...imessage doesnt works. a lot of things don't work.
It's really weird because if I try to reset my iphone and erese everything all seems to work ok so I dont think is a carrier problem. If i restore the backup I start to notice the problems.
What can be the cause?
Anyone experienced a problem like this?
Thank you
Ivan

You should have specified in the title that it's about a MacBook Pro.
Does the same thing happen with other Linux distributions, OS X, or Windows? Because you should be trying to determine if it's a hardware problem or a software problem.
Did it start happening recently, as in, after an update? Intel HD 4000? Check /var/log/pacman.log and downgrade the driver to whatever worked before. But if it's a hardware problem (i.e. it happens on OS X, other distributions, etc), then you need to take it in to the shop, if warranty still applies.

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Product iOS: 8.3
Background: I listen to Pandora at work through my iPhone 6. My work has pandora traffic blocked through their WiFi network. I want to keep my iPhone connected to the work WiFi because 1) I don't want to turn on and off my WiFi on my phone 2) I want to my email and other apps to use WiFi since they are not blocked.
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2) Switching to a different streaming music providers that aren't blocked by work WiFi- I pay for Pandora One and I like this service the best. I really don't want to switch.
3) Download music to iPhone memory- I pay for Pandora One and I'd like to use it.
4) Jailbreak- Not sure if this a solution but I'd rather not jailbreak my device.
Question: How can I restrict certain apps (Pandora) to use cellular data only?
Best Regards,
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