I have a samsung grand duos which i have been happy enough with. However I have just noticed that I cannot seem to use the data ont he second sim card. As my data was nearing it''s limit on sim card one I decided to select sim card 2 for data (I know it is only 2g but should still allow me to receive email etc). I went to settings and sim card manager and selected the second sim for the data but it does not connect. The sim does work for data in another phone. Is this a problem with the phone or am I missing something in terms of settings.