The "phaton 4g" is not the D3--rooting one phone does not necessarily lead directly to rooting the next. I'm not sure where you are looking for information concerning rooting the D3, there are threads all over the place. Perhaps you are asking the question with the expectation that root had been achieved and so are looking past all the posts shamelessly begging for root and the threads that say its close. Your expectation is however unfounded and the fact that you have not found a thread on how to root the D3 does indeed mean it hasn't been rooted.
What's up with the moto-promise of unlocking the bootloader?
They have a good track record of promises, after all, the XOOM did get 4g as promised.
The photon is very similar in hardware so its not too crazy too think one might lead to the other.
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