Apps not working while roaming?

I use Tmobile UK and I got to Amsterdam last night. My whatsapp stopped working and today I rebooted the phone and now all my apps except Chrome and Gmail do not work.

I having a roaming plan with TMobile so I'm not sure why my apps have stopped working. Do I need to enable certain stuff to keep them working?

I recently switched from BB to Samsung Galaxy S3 so I'm still new to Android.

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