Problems connecting to MEO Portugal (solved)

I have problems to connect to MEO Portugal using one of their unlimited data SIMs... up seems to work, down not, it also doesn't get a DNS server. It looks like the problem thats mentionend with the TTL but setting the TTL doesn't help unfortunately.

Any hints? Did anyone succeed to connet to MEO in Portugal?

Please share all necessary additional information, see How to get support quickly

I finally succeeded by setting the IMEI, which i got from my old ZTE mobile router:

AT+EGMR=1,7,"8626980xxxxxxxx"
AT+QPRTPARA=1

The TTL setting didn't seem to be necessary