It seems like MTN can generally be found where there is an opportunity for "under the table" deals and personally I think one of the advantages which they promote is that they are very willing to assist leadership of said country to spy on the population.
It's more likely that Syria would have contracted cell operator to include the message when roaming clients entered the country.

Could be, but still MTN in Syria. It states there. SyriaMTN. Here is their website
http://www.mtn.com.sy/
This is their company logo
View attachment 127109
They've never been surreptitious about being a provider in Syria.
See here: http://mtn-investor.com/mtn_ar2012/ops-syria.php
They are also in Iran, Ghana, Uganda, Sudan etc.
Most of those are states with bad human rights records![]()