A method for managing mobile device roaming, comprising: receiving, at a gateway associated with a Visited Public Mobile Network, VPMN,, a request message from a Long-Term Evolution, LTE, device associated with a Home Public Mobile Network, HPMN,, wherein the request message requests wireless access to an LTE access network associated with the VPMN; enabling, at the gateway, registration of the LTE device to the LTE access network associated with the VPMN; providing, at the gateway, an Internet Protocol,, connection to the LTE device, characterised in that: the HPMN is a non-LTE-capable HPMN and a roaming hub is deployed between the HPMN and the VPMN, in order to enable outbound roaming of a subscriber equipped with an LTE device and associated with the non-LTE HPMN into the LTE access network of the VPMN, wherein an LTE roaming agreement exists between the VPMN and the roaming hub, and no LTE roaming agreement exists between the roaming hub and the HPMN, wherein enabling registration of the LTE device comprises interworking between a Diameter S6a interface and a Mobile Application Part, MAP, Gr interface, wherein the roaming hub is executing an interworking function between the Diameter S6a interface towards the Mobility Management Entity, MME, of the VPMN and the Mobility Application Part, MAP, Gr interface, towards the pre-Release 8 Home Location Register, HLR, of the HPMN, wherein the interworking function derives and replaces Universal Mobile Telecommunication System, UMTS, authentication vectors with Evolved Packet System, EPS, authentication vectors, wherein the interworking function derives and replaces the General Packet Radio Service, GPRS, subscription information with the EPS subscription information. receiving, at a gateway associated with a Visited Public Mobile Network, VPMN,, a request message from a Long-Term Evolution, LTE, device associated with a Home Public Mobile Network, HPMN,, wherein the request message requests wireless access to an LTE access network associated with the VPMN; enabling, at the gateway, registration of the LTE device to the LTE access network associated with the VPMN; providing, at the gateway, an Internet Protocol,, connection to the LTE device, the HPMN is a non-LTE-capable HPMN and a roaming hub is deployed between the HPMN and the VPMN, in order to enable outbound roaming of a subscriber equipped with an LTE device and associated with the non-LTE HPMN into the LTE access network of the VPMN, wherein an LTE roaming agreement exists between the VPMN and the roaming hub, and no LTE roaming agreement exists between the roaming hub and the HPMN, wherein enabling registration of the LTE device comprises interworking between a Diameter S6a interface and a Mobile Application Part, MAP, Gr interface, wherein the roaming hub is executing an interworking function between the Diameter S6a interface towards the Mobility Management Entity, MME, of the VPMN and the Mobility Application Part, MAP, Gr interface, towards the pre-Release 8 Home Location Register, HLR, of the HPMN, wherein the interworking function derives and replaces Universal Mobile Telecommunication System, UMTS, authentication vectors with Evolved Packet System, EPS, authentication vectors, wherein the interworking function derives and replaces the General Packet Radio Service, GPRS, subscription information with the EPS subscription information.