Using an Orange locked phone

[Kahve123]

I have an old Siemens S55 phone locked to Orange (last used around 2005)
I tried the EE unlock service but they said its too old & they don't have the codes.

1) Since Orange (& T-mob) is EE, can I just use an EE sim in it?
If so, does it have to be a sim direct from EE or can I use a provider that uses EE network?

2) If it must be unlocked, what are my options?

3) the phone is gsm which as I understand is 2G. & from what I read EE supports 2G until 2029. Is this correct?
(the phone has the old orange sim in it now & it seems to detect T-mob, Voda  networks. I'm not sure if this is reality or a left over preference of UK networks in 2003)

Thanks for your advice.

[XRaySpeX · Accepted solution]

1. No, it is locked to Orange.
2. Probably none.
3. Yes, EE supports 2G but will start switching it off from May 2029.

[Kahve123]

Ok, thanks for the info.
Disappointing, but I'll continue to check for unlocking options. I'm really keen to get it back in action, its the best phone I ever had.
I will be extra cautious of the online services, the scam risk is high.

[XRaySpeX]

Thanks! You're welcome 🙂 ! Glad I could be of assistance & hope it soon gets sorted.