&gt; Bolt down the hardware to restrict use out of specs<p>That&#x27;s what I was thinking, require their signature to change bits that could harm the phone. You could even market this feature: most phones only have change-able back-plates. I&#x27;d bet that people would jump at the chance were they to <i>see</i> how drastically Cyanogen or MIUI changes their phone - don&#x27;t just give people the chance to install any ROM, but actually provide a few of the more popular ones ready to go.<p>&gt; But do you think an addon that bolts to the back would be okay for you?<p>With the module system of the G5 this seems completely plausible. When you frame it that way you can really see how LG [are trying to] shine in the blandness that is the current cellphone market.