As a Yettel customer living in Bulgaria, I recently travelled to Dubai for a week. While overseas, I closely followed the roaming instructions on the Yettel app and website. Specifically, I purchased and activated an €8 data roaming package (1 week, 1GB). Every step of the activation was confirmed by sms sent to my phone. I used the data very sparingly, mostly relying on free WiFi at the hotel and at shopping malls. Since coming back to Bulgaria, Yettel has sent me bill after bill, totalling €200+ so far and counting. The staff at their Razlog branch tried to convince me that there is no UAE roaming package (?!) and/or I never activated roaming services on my phone (??). Lesson learned: Never ever roam with Yettel. A few MB of data will cost you more than your plane ticket, whatever package Yettel may have promoted and sold you.
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