My experience from Germany is that you do NOT use the Force Operator feature, it just doesn't want to connect.
Use the auto operator selection AT+COPS=0
Bands 8 and 20 are used in Germany. 8 Deutsche Telekom and 20 for Vodafone.
If you use the T-Mobile NL simcard, this is your APN.
If you use an other simcard, check with your provider.