Sim only router using data when roaming

[Zorro]

My O2 sim has 30Gb monthly roaming data so I have it in a Zyxel NR5101 router whilst in France. However it is using around 1Gb of data a day in excess of any actual use. Can anyone explain why and what can I do to stop it?

[Enlli]

It's 25GB max in any billing period for a maximum of 63 days

Short of putting your SIM in a phone to see if that reduces consumption to prove if it is a network or router issue, I'm not sure what to suggest

[madasaf1sh]

@Zorro 

You need to check all your connections on the router, and see what devices are using the data, as it sounds like something is checking in and doing updates.. 

What I would do is go into the router and disconnect all devices and then reconnect then one by one, and just to let you know if on PAYM then your limit is actually 25GB per month and not 30GB

[Zorro]

Thanks madasaf1sh, I did all that and with no one connected it still used 1Gb a day! I have it installed back in the UK now and it's not using anything so I think it must be to do with roaming.

[Zorro]

Thanks Enlli, I tried that and with the sim in a phone it didn't use any excess data, as soon as it went back in the router, off it went again using 1Gb a day. Wierd

[madasaf1sh]

@Zorro 

It sounds like then the device was trying to do something, and failing. I would out of curiosity speak to Zyxel and get their thoughts...