Environment
SIM type: applicable to all
Device: applicable to all
Question
Do SIMs have any priority order of networks based on signal strength?
Answer
No. Onomondo SIMs have no preference lists on them.
Cause
Onomondo SIMs are non-steered (PLMN list on the SIM is empty).
Instead, we simply allow the radio module to choose a strong enough network according to 3GPP standards.
SIMs are designed this way to avoid weak signal selection and reduce registration times.
It is the module, not the SIM, that scans for available networks and reads their signal strength.
It is up to the device to choose the first network with "strong enough" signal (-85 dBm).
You can read more about the automatic network selection process in this article.