I'd be more worried about these spam texts coming from my number to my own contacts that I have previous conversations with than to myself. E.g. why wouldn't my

I'd be more worried about these spam texts coming from my number to my own contacts that I have previous conversations with than to myself. E.g. why wouldn't my grandmother click some link I sent to her? (My first thought was that these texts could just be from some malware on the phone itself, possibly with access to the contacts. But if it's actually an externally sourced spoof, that's obviously less dangerous...unless they somehow got my contacts I guess)