Section 4.3.4 of the AT command manual for the EC25(-AF) shows the following. I usually ran the disable command for Visible as part of the configuration process. It should be the same for the EP06.
Disable roaming immediately
AT+QCFG="roamservice",1,1;
Enable roaming immediately
AT+QCFG="roamservice",2,1;
Here is a link to the EP06 AT command manual
Here is a link to the EC25 AT command manual as well