is the S5 OK for calls and texts? It's just mobile data that you're unable to access?
Is data roaming turned on, on the handset.
Possibly: Settings > More Networks > Mobile Networks > Data Roaming.
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I'm really sorry to hear you're still having issues with this.
Could I just ask if you swap the SIMs over, does the issue appear to follow the SIM or the handset?
This will help us to narrow down the cause of the issue.
Mark YForum Team
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Thanks for your post.
Have you been able to sort things our with the team?