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Hi @Trent_Nicholas . Does your phone have a data usage display?
Can it display month by month and data usage by app?
@Trent_Nicholas . When you say "comes under hotspot as “Other devices” ", is this how the phone displays the usage? Phone is showing 18.5GB used?
Does it distinguish between usage from itself (browser, mail app, ...), and usage from hotspot?
You recognise your devices by name/ip address. Are there any you don't recognise?