You have me stumped on this one. In full disclosure, I'm not even sure what the range is or if we even have a specific range you can set.
Ithink the op is looking for the ranges of dynamic addresses that T-Mobile uses to assign to customers. There is a pool that gets assigned, even tough there won't typically be the same, that come from a pool available for assignment.
FYI...using whois I get this:
Registration Date: 9/18/12
Org: T-Mobile USA, Inc.
Org Handle: TMOBI
Address: 12920 SE 38th Street
Postal Code: 98006
Country: UNITED STATES
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I was looking for something like this and came across https://whois.arin.net/rest/org/TMOBI/nets and lists a lot more subnets for t-mobile.