How to buy 71 MB Data only @ BDT26 in Robi?*8444*71#

Offer Details            :71 MB Data only @ BDT26

Allowed Tariff Plan :Prepaid

USSD : *8444*71#

Validity                       :1 day
Summary:

Volume	Charge with VAT	Validity	Activation code
71 MB	29.90	1 Day	*8444*71#