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There are different types of sim cards for different uses.
The mobile sim card you have uses data off the Vodafone Live APN - which is covered on Vodafone Billpay and Prepay plans.
Routers however do not tend to go through the Vodafone Live APN, and therefore you would be charged for the usage as out of bundle usage.
What you need here is to pick up a data sim from Vodafone. These are the sim cards that are used with their mobile wifi devices and are priced on the correct APN for their use.
It is not possible to use a SIM configured for a phone in a device that is not a phone without incurring these charges.
The same also applies in reverse.
Hope that helps
Our apologies for the delay in responding to your query. We wish to advise you that if you are using a Prepay Sim in a Mobile Broadband device this will automatically connect to the HS APN. This will then use your credit instead of your plans allowance, as usage is not included in any of our Mobile phone top up offers. We also wish to advise you that if there is usage on the Hs APN this any charges associated to the usage would be valid.
However, if you purchase a Mobile Broadband add on instead of a Pay as you go plan this will provide you with a data allowance that can be used through the Hs APN and you will incur no extra charges.