Originally, T-Mobile did not administer the network that existed in the Great Plains. The Iowan network, as everyone knows, is controlled by Iowa Wireless Services. But what isn't as well known is that the spectrum (and the associated network) for the rest of the area was controlled by Cook Inlet.
For those who don't know, Cook Inlet Region, Inc is an Alaskan company that develops businesses to support the local Alaskan communities. One of the more unusual ventures of Cook Inlet was partnering with Western Wireless/VoiceStream to create a joint venture to acquire PCS licenses to construct a GSM network across the western half of the United States (and some parts of the Northeast), excluding Iowa. Cook Inlet constructed the facilities, dealt with permitting, acquired phone numbers, and such. VoiceStream would act as the "face" and sell the service, while paying Cook Inlet to have exclusive access to resell service on the network.
Cook Inlet's economic share in the venture gradually declined since the VoiceStream/Omnipoint/Powertel merger and Deutsche Telekom acquisition. However, Cook Inlet continued to hold a stake (and control) until last year. Last year (after the T-Mobile/MetroPCS deal closed), all the Cook Inlet/VS subsidiaries that represented T-Mobile's PCS licenses and carrier authorizations were folded into T-Mobile License LLC after T-Mobile bought out Cook Inlet from the venture. This was also disclosed in 2013 Annual Report to Stockholders issued on February 2014. Prior to this event, T-Mobile could not legally acquire phone numbers (it technically didn't own the facilities it used and was constrained by the terms of Cook Inlet). Cook Inlet didn't want to go through the effort and pay for the numbers for Omaha (which it never really cared for, not like Las Vegas), so T-Mobile never had numbers. And T-Mobile was capital-constrained in 2010-2012, so it wasn't really going to dedicate limited cash to give to Cook Inlet to acquire blocks of numbers then.
And USCC also controlled 850MHz spectrum throughout Nebraska for years before entering Omaha after the turn of the century. Area codes 402 and now 531 cover more than Omaha, you know. Even though the Omahan network was new, USCC had a presence in Nebraska for years. So of course it had numbers.
Blaming 3GPP technology is stupid and irrelevant. AT&T and Viaero Wireless both have Nebraskan numbers due to their legacies in Nebraska. And the sheer number of phone numbers used in Nebraska triggered number pooling to be implemented earlier than most states, and number allocation rates still remained high.
For Omahans' sake, I do hope T-Mobile does want to really serve the market. While one of the issues has only been recently addressed (T-Mobile being formally authorized as a carrier in Nebraska), the other issues do need to be dealt with (network quality and phone number allocations) in order to do well there. Now that T-Mobile has cash and is growing, I hope it will do something soon.