In this lesson you know that,

After the Attach Procedure succeeds, the following should be accomplished,

• 'MM context' is established on the UE and the SGSN.
• Authentication occurred between the SGSN, and the UE.
• The UE received the P-TMSI, and stored it in its MM context.
• The SGSN retrieved the subscription information of the UE, from the HLR.
• The HLR knows which SGSN is currently serving the UE.