Good day,
i am curious as how to go about getting a list of subscribers from a mobile network operator, is it that you'll have to talk to the network operator themselves or is there a way to go about it.

for example, where i come from, there are couple of mobile operators and a client once asked me if he could send an sms to mobile subscribers nationwide(i also provide sms solutions).

so am curious as to how to go about getting/pulling subscribers from a mobile network operators.

Thank You