Hi,the message that pops up saying "Network Service Unavailable" might be from the message settings not correctly set and it is unable to send messages.
You can go to the message setting options on the cell phone to confirm if it is rightly set.
To be sure, you can also use the sim card on another phone to confirm, by using the a friends phone to send a message.
If the message settings are correctly placed, the problem might be from the sim card. You willneed to contact Sim service center for help to rectify the problem for the Sim card..
Take care...
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