I am relatively new to Mobile Forensics however I may be able to shed some light. As far as i'm concerned the closest you will get to 'bit to bit' physical imaging would be performing a physical extraction on the mobile device. A physical extraction will dump the raw data from the partitions on the device.
The biggest issue here is whether or not the phone in question is supported for physical extraction. I personally use AccessData's MPE+. With MPE+ there are only a handful of devices that are supported for physical extraction. The same goes for other leading software (cellebrite, paraben, oxygen forensics, etc.). So I suggest consulting the supported devices list for any software you are interested in as a starting point and move from there. Hopefully that helped a little bit.
Dan
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