My straight talk iphone 6 says that the number I have dialed is invalid?

EVERY number i dial it says that it's invalid, but i know that its not. These are my saved contacts and i know that their phone isn't shut off. I have tuned my phone off and back on, i have taken out my sim card. I don't know what else to do, but i need to make phone calls.

Is the phone unlocked?
Is the phone compatible with the SIM?
Is the service active?

Try factory reset phone

Then call Straight Talk. We can't help from here

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