SUM filter if contains text - Issue

Hi,

I am trying to calculate SUM of a field if another field contains a value.

I tried the following formulas but neither work:

I tried using a wildcard symbol (not sure if it works in DAX) but no data showed up:
Consumer Handset Plan = CALCULATE(SUM('Sales Data'[Qty]),'Sales Data'[Plan Type] = "*Mobile*")

This one gives me an error:

Consumer Handset Plan = CALCULATE(SUM('Sales Data'[Qty]),Contains('Sales Data','Sales Data'[Plan Type],"Mobile")) 

Cheers