Just got another K3565 dongle. Plugged it into my laptop. Ran diagnostics, all present and correct. Connected to the internet. All OK. Ran a balance check and got back the message £0.12. All fine. Turned off the laptop and went to the shops to buy some credit. Got home and turned on the laptop. Device found, network found and then, lo and behold, it wouldn't connect. Sim id and number not in diagnostics anymore. What is going on? I am beyond furious about this. Are Vodafone trashing these sims? I want my sim id and number back so I can use this device. Please reply to this post URGENTLY.
I'm sorry to hear of the problems you are having here.
In the Vodafone software, is it showing any reception at all? What colour is the light flashing on the device?
The first thing that I would suggest to try, is to put the Sim card from the modem into a phone and turn it on. Then try it again in the modem. If it has fallen slightly behind on the network, this will update it.