LTE,CDMA,GSM "what the Secret and why is it a secret"

On all site and Manufactures and Developers you fine the newer version of software and upgrade of useful futures.
I am looking to have a question answered : what is the secret to update and change and fully alter Bandwidths . Let's say I live in China, England ,South America any ware in the worked but my phone is only limited to your region. i want the ability to make the changes for the phone to adapt to all regions.
Most phones have All GSM Checked to receive on CDMA the basic setting used to the manufacture believed needs. LTE has bands b1,2,3,7, 34,35,36, but i need b1,2,3,4,5,7,11,20,21, . How can I update this on you rom .
Is the anyone out there that understand the needed flexibility of an universal market please or does it boil down to equity needs.

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