Stalker ex advice

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Is anyone familiar with the text free app? I got this random text from a number with an area code I have never heard of so I googled the number to find out it’s from a text free app. I replied to the text and I received “This phone number is no longer in service.” I’m wondering if it’s the person saying that or if it’s the carrier texting that. I have a feeling it’s my stalker ex texting me so I just want to confirm if anyone would know!