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@@ -13,6 +13,16 @@ Powertel, PSC Wireless, Qwest, Rogers, Southern Link, Sprint, Suncom,
T-Mobile (US/UK/Germany), Telefonica, Tracfone, Virgin Mobile, Verizon Wireless,
Vodafone (UK, Egypt, Italy, Japan, Spain), and many more ...
+== Opt-In Warning for Some International Carriers
+
+Some International carriers require that their users subscribe to an Email to SMS
+feature before they are able to receive SMS messages this way. If one your users
+mentions that they are not receiving their messages, chances are it is due to this
+limitation.
+
+Some carriers that need this include, Mobitel, Etisalat, T-Mobile (Netherlands),
+etc.
+
== Setup Instructions
Add this this one line to the controller you want to be able to use SMS Fu in.