Is this when you connect by wireless to your homehub or when using the 3G signal?
Do as John has suggested, and also renew the IP address on your ipad and iphone. Go to Settings > Wifi > Locate your Homehub network and tap "Renew Lease". If that doesn't help you should "forget" the connection on the ipad/iphone, restart the device then remake the connection.
As regards the part on your post that says "posted from my mobile" that is just the site recognising it is from a mobile device, not necessarily a mobile phone.It is nothing to worry about.