Dear Kevin,
Thank you for reaching the Small Business Support Community.
As per the below USB compatibility list; I see no Alcatel USB modem is currently supported for T-Mobile Germany on RV215 routers;
https://supportforums.cisco.com/message/3852720#3852720
I therefore suggest you to contact the available support channel in your country to open up a service request to add your modem to the supported list;
https://supportforums.cisco.com/community/netpro/small-business/sbcountrysupport
Please do not hesitate to reach me back if there is any further assistance I may help you with.
Kind regards,
Jeffrey Rodriguez S. .:|:.:|:.
Cisco Customer Support Engineer
*Please rate the Post so other will know when an answer has been found.
Jeffrey Rodriguez S. .:|:.:|:.
Cisco Customer Support Engineer
*Please rate the Post so other will know when an answer has been found.