If you are zong customer and using any kind of zong sim then you can try this small option when you are short of balance and even you have no message package, dont worry by this tip you can contact with your desire number of any network.
Just follow step by step below or watch tutorial video about this
How to send free sms to any network.
Step1: Open your mobile dial pad
Step2: Now dial *100# when you dial it a new page open with 3 options chose 1st option form these options
Step3: Now there is a message that enter your number so you need to enter your desire number where you want to send message.
Step4: write your desire number in step 3 and press ok now you have done
if you are not understanding this step by step guide so please watch this video and if you like this video so please give your feedback here or even on video comments.