SL 2.0 not reachable via Bridge with LTE-Router

I am using SL 2.0 with Bridge-App on Samsung S3 and LTE-Router AVM 6820
I can‘t reach the Lock when leaving BT Area although the Lock shows good connection via Bridge. Is it because of the private IP the mobile Net uses? Has anyone got the Bridge App working with mobile internet connection via LTE?

Could you send us a log-file of the Bridge-App?