How do I manage my account via text?

Just text MENU to 6700 to see a list of shortcodes you can use to manage your Mint account. Or use one of the following:
BAL – check your renewal, wallet, and international roaming balances and plan renewal date
DATA – check your current monthly data usage and next data reset date
UPDATA – add 5G • 4G LTE data to your plan if you run out
ROAM – check your international roaming balance and wallet balance
UPROAM – buy international roaming credits