My client has an AT&T Samsung Galaxy S5 and uses Exchange Online service from Microsoft. Everything works great except for when he is out of the country (London in this case). This past week he was in the UK and could not receive any emails to his phone but could send out. He has International plan for data and can browse the Web and send/receive his Gmail without any issues. When he is on wifi his Exchange emails work normally. We have contacted AT&T as well as Microsoft and got nowhere. On the Samsung phone the Restrict background data is off and we turned off the Smart Network Switch as well. Any help would be much appreciated! Thank you!