You can purchase an American SIM card for your phone at most major electronics stores, mobile phone carriers, or online retailers.
You can purchase a SIM card for your mobile phone in Cuba at official ETECSA stores or authorized resellers.
You can purchase a SIM card for your mobile phone in China at most convenience stores, mobile phone shops, or at the airport upon arrival.
You can purchase a Japanese data SIM card for your mobile device at electronic stores, convenience stores, or online retailers in Japan.
You can purchase a Chinese SIM card for your phone at most convenience stores, mobile phone shops, or at the airport when you arrive in China.
You can purchase a Philippines prepaid SIM card for your mobile phone at convenience stores, mobile phone shops, or at the airport upon arrival in the Philippines.
You can purchase a GSM prepaid SIM card for your phone at most convenience stores, electronic stores, or directly from mobile service providers.
You can purchase a prepaid GSM SIM card for your phone at most convenience stores, electronics stores, or directly from mobile service providers.
You can purchase a Taiwan prepaid SIM card for your mobile phone at convenience stores, electronics stores, or at the airport upon arrival in Taiwan.
I have an unlocked Blackberry 9670. Can I purchase a boost sim card and use it in that phone.
You can purchase a prepaid SIM card at most convenience stores, electronic stores, or mobile phone shops near your location.
A phone SIM card is built to an industrial standard, they will fit and work in any phone manufactured by any manufacturer - they all have and provide standard SIM card connectors. However, some Mobile Phone companies who "give" you a free phone as part of a contract deal with, them LOCK the phone to their service (in software in the phone), which means that that phone will only work with a SIM card provided to you by them. It is possible to get the phone "unlocked" or to purchase a "SIM free" phone which then allows you to use any SIM in the phone.