A guide produced by the Madison Police Department documenting the use of iP-BOX a tool that can unlock iPhones and other iOS devices that have been secured using a simple 4-digit passcode.
Prior to sending any request to a foreign country, make sure your have exhausted all internal/national sources of obtaining the required electronic data/evidence. Note that this data/evidence can be obtained, among other things, from open sources (i.e. publicly available information) and/or directly from Internet Service Providers (ISPs) established/registered in your country as affiliate companies of foreign-based ISPs.