How to blacklist Moroccan mobile networks on Oppo A74 4G (CPH2219, Android 13) to prevent accidental roaming from Spain?

I'm in Spain, near the southern coast, and my phone sometimes connects to Moroccan networks (Maroc Telecom, Orange Maroc, Inwi) when I am close to the shore. This causes unwanted roaming charges. My device: - **Model:** Oppo A74 4G (CPH2219) - **Android version:** 13 - **Build year:** 2022 - **Root access:** No root - **Carrier:** Spanish operator (Movistar, Vodafone, Orange...) What I want: - A way to **blacklist specific PLMNs** (MCC/MNC codes 60400, 60401, 60402) so the phone will *never* connect to them. - Ideally, a SIM/Android-level solution similar to editing the FPLMN (Forbidden PLMN list). - I know how to lock my phone manually to Movistar, but that’s inconvenient — I’d like something automatic or permanent. What I have tried so far: - In **Settings → Network selection**, I can manually choose Movistar, but that only works until the signal drops. - Disabling **data roaming** prevents data charges, but the phone can still camp on Moroccan networks, which is disruptive. - I checked /dev/smd* devices via adb shell:

crw-rw---- 1 radio radio 239, 5 /dev/smd11
crw-rw---- 1 bluetooth bluetooth 239, 3 /dev/smd7
crw------- 1 root root 239, 4 /dev/smd8
crw-r----- 1 radio radio 239, 2 /dev/smdcntl8

I know that in theory AT commands (e.g. AT+CRSM to edit EF-FPLMN) could be sent via these modem interfaces, but without root I can’t access /dev/smd8. **Questions:** 1. Is there **any way (without root)** to permanently blacklist specific PLMNs on Oppo/Qualcomm Android devices? 2. Can AT commands be sent to the modem via an accessible interface like /dev/smd11 (with radio permissions)? 3. If not, are there other Android or SIM-level mechanisms to block Moroccan networks specifically while allowing normal EU roaming? I found references like [Onomondo: How to clear the FPLMN list on a SIM](https://onomondo.com/blog/how-to-clear-the-fplmn-list-on-a-sim/) , but they assume direct AT command access to the SIM, which doesn’t seem possible without root. **What I am not looking for:** - Disabling roaming completely (I still need EU roaming). - Manual network selection every time I move around (too inconvenient). - Just disabling mobile data (the phone still camps on Moroccan networks and I may miss calls/SMS).