Default SM-N900 UIM/SIM blocked ?

Hi,

I have a Note III, buy in China SM-N900, and I suppose that this phone is unlocked because I already use it in France with my french SIM card and also in China with China Unicom card.
I recently buy new sim card (in fact it's a UIM card from China telecom), but it cannot connect to any network.

Does my phone locked in some way to accept only SIM card ? I don't know.

If someone get more information about that...

Thanks a lot