The disclosure relates to the field of wireless communications, and more particularly a method of establishing an IP connection through a 3GPP mobile network, at least partially of IP type, a network equipment item, MME or PDN-GW, of that mobile network, a mobile network infrastructure, a mobile terminal and a corresponding system. The method includes the following steps, on a first equipment item, MME or PDN-GW, of the mobile network other than a mobile equipment item UE of the mobile network: receiving a fully qualified domain name, FQDN, sent by a mobile equipment item, UE, of the mobile network, the FQDN identifying a target data server; and on reception of the FQDN, triggering the resolution of the FQDN into an IP address of the target data server. Thus, a mobile user equipment item provided with a UICC card may be produced at low cost without incorporating DNS resolution mechanisms.