How do banks track down defaulters? They use the little information they have to try and track you down.
On the other hand Safaricom has a huge database of numbers you have called (frequently) for the longest period. You default, your relatives, friends, employers are accosted and believe you me, THEY WILL FIND YOU!!
This is a great product - in my own view. Most banks are currently offering Deposit & withdrawals services using/via MPesa and these transactions are charged (between 20/- to 100/-).
If i receive a ka loose 10K, it makes more sense to deposit to my Mshwari Ac until a time when I need it with NO Charges and I get to earn a little interest while building my credit worthiness for a rainy day when i may need to "Okoa Jahazi"
Off to read the T&Cs
A successful man is one who makes more money than his wife can spend. A successful woman is one who can find such a man