LB 1120 Changing Providers

I have been using LB1120 modem supplied to me from a company to provide me with 4G LTE internet.  The company is going out of business.  I found another company that indicated that they would provide me with a new SIM card but would not support the LB1120 modem.  I have found that the modem works well for basic internet, but if I try to stream YouTube TV, I have problems.

My question - could the LB1120 modem have some sort of proprietary setting established by the first provider that I would not be able to override, or are all settings able to be modified by me to correspond to the new provider's requirements, specifically the APN?

TIA

Jim P.