Do you always use the same number for one account?

I want to buy some sim cards to phone verify accounts and the question is if I need to store them for later use.

When you phone verified an account and it gets a phone verification request again in a few weeks do you use the same number you used the first time or doesn't that matter and a new number works just as well?

I'm asking because in this case IG puts the number you used already into the field, maybe this could be a red flag if a different number is used?
Or maybe it is a red flag if one number is used too many times to verify one account?

What's your opinion?

I'd use the same number just in case. Like you said "I'm asking because in this case IG puts the number you used already into the field, maybe this could be a red flag if a different number is used?"

I always use the same number.

The best choice you have is to use the same number. So far, no users who used the same number reported they received "red flag".

Well, how likely would it be that some random user changes his phone number every 7-8 weeks? Go with the same number as long as it works.