How common is the SIM Mobilie Country Code (MCC) lock? How hard to unlock?

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I read that some phones, besides being locked to the issuing carrier, they have a country code lock, which says that the phone won't connect to systems with particular country codes and that cracking the country code lock is a lot more difficult than the SIM unlock.It says it restricts the use of the phone to specific countries and will only work with a SIM issued in one country.

If a phone has a Mobile Country Code (MCC) lock to say Canada and USA, does this mean I can't use it in Peru even if the seller "unlocked" it? Does "unlocked" usually include country code unlocking? Is this usual in iPhones? How hard is it to unlock a MCC lock? I wanna buy a iPhone 4s or newer.

I'm quoting from wikipedia:
A SIM lock, simlock, network lock or subsidy lock is a capability built into GSM mobile phones by mobile phonemanufacturers. Network providers use this capability to restrict the use of these phones to specific countries and network providers. Generally, phones can be locked to accept only SIM cards with certain International Mobile Subscriber Identities (IMSIs); IMSIs may be restricted by:
• Mobile country code (MCC; e.g., will only work with SIM issued in one country)
• Mobile network code (MNC; e.g., AT&T Mobility, T-Mobile, Vodafone, Bell Mobility etc.)
• Mobile subscriber identification number (MSIN; i.e., only one SIM can be used with the phone)
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Posted 4 years ago

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I've read that Samsung region locks their phones but that the region lock is automatically removed when you activate in the home region. Otherwise I haven't read anything about this, but I know it's never been an issue with Koodo.