I'm getting text messages from random people?

So my friend texted me asking for a minecraft server and i tried to connect to it and failed but then he randomly sent me a picture of his cat and i noticed and checked out the picture and it was under a different number so i opened the picture on my iphone since ime texting off it and after viewing it i got messages from two people one say 'tori then moon and back' and then 'reanna yeager.who are you?!' so then i asked my friend if he was texting me/ spamming me and then he said know so i talked to the two random people for a bit and was trying to get them to tell me how they got my number but they never said so i just stopped texting them and soon after i stopped another person texted me which i have not replied back. They havint called me yet or texted me since but they kept asking me what my name was then i told them a fake name and then I said it may be my real name it may not and one of them freaked out and cussed at me asking me to tell them what my name was which i never told them so i have no idea what to do cause i'm a little freaked out been looking outside my window since and should i restore my iPhone just in case of spyware or something please help me!

Added (1). PS: I put my phone in airplane mode and 3g off just incase of gps tracking and I turned off my phone…

Well it could be a group of ppl trying to freak u out, maybe they made up your number or something, some apps you may have downloaded or something you signed into it could be anything or anyone i don't know lol, hope they stop

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