Are you trying to say about the interest on the bitcoins while saving them?. There isn't any wallet which offers interest on savings, may be in future we will have any.
Yes no wallet will give you interest on bitcoins but I don't think that you need any interest on bitcoins as you can easily make profits with it by selling it when price goes higher and that profits will be higher in compare to the interest that banks will pay you.
Maybe interest will be provided in future, but I also think its not necessary, but it will be just a extra addition to the profit.
But this addition might bring old peoples and peoples who likes inerest.
I think its long way as a bank or wallet can only provide interest when they can earn enough amount and I believe many doesn't as many charges very less or nearly no fees.