Forum Discussion

Anatoli_3293303's avatar
Anatoli_3293303
SMARTY Rookie
08-02-2026

Sudden "Not Registered On Network" (after 1.5 years) - but only with SMARTY SIMs

Summary - after 1.5 years, "Not Registered On Network" situation with a particular phone and ANY SMARTY SIMs (but Vodafone SIM works perfectly).

Phone: Samsung S22 Ultra 5G, owned and used it for the last 2.5 years

SIM: SMARTY - used for the last 1.5 years (we have 3 SMARTY sims in the household)

On Friday, the phone suddenly started presenting "Not Registered On Network" message (and hence unable to make/receive calls/SMS/mobile network. The phone shows as connected to network (4 bars) and allows me to make emergency calls. SIM is recognised - it has its details shown.

The same SIM works in other phones. Other SMARTY SIMs are NO LONGER working on this phone. However, my company SIM (vodafone) DOES work in this phone. IMEI check shows as CLEAN.

Eg the problem is the combination of THIS particular phone and SMARTY SIM.

All the usual troubleshooting (restarts, cleanup, etc) to no avail.

Talked to SMARTY tech support without success - basically "your account is current, your SIM works in other phones, so not our problem". 

Talked to Samsung tech support - "phone is fine, SIM is fine, your network operator refuses to register it on the network for some reason - talk to them"

Tried to talk to Three, but since I am not a direct customer of them - they are not interested. 

Could SMARTY - which presumably has better relationship with Three, help in some way?

2 Replies

  • Dodo_Juiced's avatar
    Dodo_Juiced
    SMARTY Pioneer
    09-02-2026

    Sounds like what happened with my sony xperia. In my case the issue is due smarty seeing my phone as "incompatible" with VoLTE, which it isn't and compatibility claim supported by Sony. Manually forcing the IMS registration has fixed it and my phone now works as normal but customer support still insist a phone upgrade is necessary on my part and keep trying to sell me a new phone.

    Complaint has been logged and currently ongoing. 

  • MSF's avatar
    MSF
    SMARTY Guru
    08-02-2026

    Anatoli_3293303​ Unfortunately, I don't think that smarty will pick up your problem from this community forum.

    If Support Team have not been able to help, you could try raising it as a Complaint to get it further up the chain.