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Click on the chat icon on the bottom right corner of the screen.

You might need to get a new sim card, have the mod to help you with this and tell them the issue. They will help you out with this. 

Yes its month to month but the offer states that Get $10 off 8 months on plan $35 and above

The discount will be applied after 30 days. The credit for 2-8 months will be applied automatically before the renewal or the payment due date.

According to PM activation the port might take between 20 minutes to 2 hours. However you can call with your number but when some one calls your number, it will go to Voicemail due to the porting being in process.