If cost ATT $4B after it failed to merge to T-Mobile. https://en.wikipedia.org/wiki/Attempted_purchase_of_T-Mobile_USA_by_AT%26T https://en.wikipedia.org/wiki/

If cost ATT $4B after it failed to merge to T-Mobile. https://en.wikipedia.org/wiki/Attempted_purchase_of_T-Mobile_USA_by_AT%26T https://en.wikipedia.org/wiki/Attempted_purchase_of_T-Mobile...