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This is only a part truth-the DSi and XL are region locked only for DSi-Enhanced games. The vast majority of DS games are normal ones that can be played on any DS system (apart from the Chinese one). There aren't many DSi-Enhanced games around, but there are some notable ones such as Pokemon Black and White.
Both CDMA and GSM phones are generally locked, however, only unlocked GSM phones can be easily switched from one carrier to another. I will address each seperately. Sim Card Sim Card Inserted. GSM Carriers (Cingular and T Mobile are the biggest two). When a GSM phone is unlocked, it will work with any active sim card.