It is presented a method, executed in a gateway, the gateway being arranged to facilitate communication between a client device and an application server. The method comprises the steps of: sending a request for an electronically transferable subscriber identity module, the request comprising an identifier based on an identity of the client device; receiving a response indicating that an electronically transferable subscriber identity module, generated based on the identifier, is available; downloading the electronically transferable subscriber identity; and storing the electronically transferable subscriber identity module with an association to the client device, along with any previously stored electronically transferable subscriber identity modules. A corresponding gateway, computer program and computer program product are also presented.