How many automated M2M devices you hv in your home which have SIM built in except mobile ? I hv none in my home. I am sure most Indian home does not have it. If this is the case in all over india then I am not sure how all 10 digit numbers gets used up and 13 digit number needs to be implemented. 10 digit numbers means 100 crore numbers and it's not a small number that will be exhausted by M2M devices unless you count mobile phones.
Am I missing something ?