LTE3316 multiple APN's ?

Hi, 

If your unit's default APN is "fix", I believe your service provider is Telia Eesti. 
As the default APN is requested by Telia Eesti as part of the customization, it is Telia's turn to determine whether your services should use the other APN instead of "fix" and also configure the alternative APN to your unit. I'm afraid I cannot help to this case. 

Could you please contact Telia's support team?
Thank you. 
https://www.telia.ee/ettevottest/kontaktid/