As of today,

For MagicSIM (all versions):
- There is no extended 1 year or 2 years validity.
- Only 1 day, 7 days or 30 days validity extension available
- Send 1DAY or 7DAY or 30DAY to 28882 to subscribe
- Subscription is available during grace period (inactive)

For Xpax (all versions prior to MagicSIM):
- Extended validity of 1 year or 2 years is still AVAILABLE
- Send EXP1 or EXP2 to 28882 to subscribe
- Subscription through ussd *118# does not work (currently)
- Subscription is available during active period only

Hope that helps.