Sorry if this is bothersome but how do I use the gpt without a phone number, I don't have a phone but I have a tablet
OpenAI official registration site requires phone verification. I don't think there's a way to bypass that. Sorry.
There are some sites out there that offer a temporary phone number as a service but I haven't tried any of them and I can't recommend any.
I don't know if this is the best or is even still available, but you could try getting a free phone number via Google Voice.
You can buy an account for 1-2$ online
