It's simple just follow these steps.

1: copy and paste this link in your browser address bar (www.zikiwe.com/gsmnumbers). And click go.

2: When you get to the site, click (Customize) button at the top.

3: Fill the form there like this
--> select your target country
--> select target network(make sure you select the right one here, it looks like this country -- network)
--> type the number of phone numbers you want.

4: Tick (Generate CSV) this is what you're taking home.

5: leave the CSV separator as [comma].

6: click (Generate) button.

7: when the numbers are generated, study the statistics and the numbers to confirm that you got what you requested for.

8: Locate the CSV at the foot of the list, it's titled (you may copy CSV below) copy and paste in notepad and save.

9: To get more numbers click(next numbers) button below the list and repeat 7 to 8.

10: when you finish, go to your bulk sms system and compose your message. When asked for number format select CSV, you'll be asked to upload the CSV. Select the saved notepad file and continue.

That's it, very simple.

[Note] bulk sms system owners, should link their clients there to get the numbers they need. This will make it easier for you clients.