USSD -Tanzania is a mobile application that will help you to easily dial a USSD code from any network operator in Tanzania(Airtel, Tigo, Vodacom). USSD -Tanzania is designed in 3 tabs, each representing the various network operators in Tanzania(Airtel, Tigo, Vodacom).
Each tab contains a list of all the shortcodes with an explanation of each code and a dial button that dials the corresponding USSD code. For instance, on the Airtel tab, you can find codes that will help you do the following:
-Purchase an Airtime bundle
-Check your balance
-Yatosha promo
-Assistance from airtel customer service
-See Airtel's available services
-Please Call me service
-Internet bundles
-Airtel money
-International pack
-Registration status
-Language change
-Voucher recharge
-Airtel zone

On Tigo tab, you can find codes that will help do the following
-Check your pre-paid balance
-Call to check your balance
-Call to recharge
-Voice package recharge
-Magic number
-Transfer of airtime
-Check your phone number should in case you forgot it
-Check your data balance

While on Vodacom tab, you will find USSD codes that will help you perform the following;
-Service menu that gives you access to all Vodacom services
-Prepaid account recharge
-Balance enquiry(contract and prepaid)
-Prepaid data bundle transfer
-Please recharge me
-Call Me service(Contract and prepaid)
-Vodacom PayPoint
-Airtime transfer
-Airtime advance which enables you to borrow airtime

The most amazing thing about USSD Tanzania is that it has simplified the hard process of sending a call me back whereby you need to have the recipient contact at hand before you could perform the service. With this app, all you need to do is just click on a button and pick the recipient's contact from your contacts list then click on 'Send' and your call me message will be sent immediately.
You also have the possibility of adding your own code to the list which you can use later.