Qualcomm’s initial batch of 5G chips won’t support 5G operations in the 600 MHz spectrum that T-Mobile has described as the foundation of its 5G plans, according to a new report.

Moreover, T-Mobile was silent this week amid a bevy of 5G smartphone announcements from the likes of Verizon and AT&T.

However, T-Mobile officials have promised that the company has other options, as well as some surprises up its sleeve.

“Sorry, we didn't have time for the sideshow,” T-Mobile’s John Legere tweeted in response to questions about the company’s absence from a Qualcomm press event this week. “@NevilleRayand team are busy working to actually build nationwide 5G. Will have an update next week on 5G device(s) and more. Stay tuned.”

Legere’s statement came shortly before PCMag reported that Qualcomm’s X50 modem—the company’s first flagship 5G chip—doesn’t support “sub-6GHz FDD,” which is the category of spectrum that T-Mobile’s 600 MHz operations fall into.

In response to questions from FierceWireless on the topic, a T-Mobile representative pointed out that the operator has a multiband spectrum strategy for 5G and is not solely focused on 600 MHz for 5G.

At the beginning of this year, T-Mobile outlined its general 5G plans: Its network vendors Ericsson and Nokia will build a 5G network across the carrier’s 600 MHz, 28 GHz and 39 GHz spectrum in 30 cities—including New York, Los Angeles, Dallas and Las Vegas—during 2018. And T-Mobile CTO Neville Ray said the operator expects to sell compatible smartphones for the service in 2019.

Thus, it may be reasonable to assume that T-Mobile’s initial smartphones may not access the carrier’s 600 MHz spectrum and instead will connect to its 28 GHz and 39 GHz spectrum holdings. However, T-Mobile’s millimeter-wave spectrum holdings are scattered across the country; for example, the company inked an agreement in February to buy 28-31 GHz spectrum in Ohio, which the carrier said it plans to use for 5G.