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hi i bought an experia m5 dual 1 week ago and I am having some issues with the data. I have the mobile networks and data roaming enabled but the 4g symbol doesnt show up and internet doesnt work
Did you try to download internet settings? From Settings -> More -> Internet Settings (You need to be on WiFi to do it)
Settings > power management > battery > tap on the graph > what do you see under mobile network
It should only when you have network coverage. Why are you roaming? if you are abroad, you have to check with your carrier/network regarding roaming coverage.
I really think it's a problem of incorrect or missing APN data. Try to re-download Internet Settings (As mentioned in my post above) or contact your carrier and let them send you internet configuration messages.