Method of operating a mobility management node in a telecommunication network, such as a Mobility Management Entity, MME, the method comprising: - initiating by the mobility management node a Packet Data Network, PDN, connection revocable deletion procedure for a device, with a PDN connection, when at least one predetermined criterion is fulfilled, wherein said at least one criterion is one of - a certain time period after the attach procedure is finished; - a device has been inactive for a certain time period; - a device is moved to idle mode; - a device goes into sleep mode; - a device which has a certain subscription parameter, set e.g. "infrequently communicating" device; - a device where collected traffic statistics of this device in the network show that resources would be saved if the suspend procedures are used; or - a combination of two or more criteria above; - sending by the mobility management node a PDN connection revocable deletion request to a network node; - receiving at the mobility management node a PDN connection revocable deletion response message from said network node, said message including an Internet Protocol, IP, address or an IPv6 prefix of the PDN connection of said device; and - storing, at the mobility management node, data indicating that the PDN connection with said device is revocably deleted, wherein said data comprises at least one of a Packet Data Network Gateway Fully Qualified Domain Name, PGW FQDN, an Access Point Name, APN, information, and the Internet Protocol, IP, address or IPv6 prefix of said PDN connection. - initiating by the mobility management node a Packet Data Network, PDN, connection revocable deletion procedure for a device, with a PDN connection, when at least one predetermined criterion is fulfilled, wherein said at least one criterion is one of - a certain time period after the attach procedure is finished; - a device has been inactive for a certain time period; - a device is moved to idle mode; - a device goes into sleep mode; - a device which has a certain subscription parameter, set e.g. "infrequently communicating" device; - a device where collected traffic statistics of this device in the network show that resources would be saved if the suspend procedures are used; or - a combination of two or more criteria above; - a certain time period after the attach procedure is finished; - a device has been inactive for a certain time period; - a device is moved to idle mode; - a device goes into sleep mode; - a device which has a certain subscription parameter, set e.g. "infrequently communicating" device; - a device where collected traffic statistics of this device in the network show that resources would be saved if the suspend procedures are used; or - a combination of two or more criteria above; - sending by the mobility management node a PDN connection revocable deletion request to a network node; - receiving at the mobility management node a PDN connection revocable deletion response message from said network node, said message including an Internet Protocol, IP, address or an IPv6 prefix of the PDN connection of said device; and - storing, at the mobility management node, data indicating that the PDN connection with said device is revocably deleted, wherein said data comprises at least one of a Packet Data Network Gateway Fully Qualified Domain Name, PGW FQDN, an Access Point Name, APN, information, and the Internet Protocol, IP, address or IPv6 prefix of said PDN connection.