In a statement on its website, Vodafone underlined what it saw as a weakness in EE's 4G - indoor coverage.
BBC: UK's first 4G mobile service launched in 11 cities by EE
The UK's fourth biggest network - Three - is set to take over part of EE's 4G spectrum, but is not due to do so until September 2013.
Not a completely fair test - I had a six lane highway virtually to myself on EE's 4G while 3G networks are becoming congested - but an idea of what the future promises.
Three is also set to take ownership of some of EE's existing 4G-spectrum, but will not do so until September 2013.
The issue was compounded when it was revealed that Apple's first 4G-enabled handset, the iPhone 5, would only work on EE's network.
Mr. JACK KEROUAC (Author, "On The Road"): Out we jumped in the warm, mad night, hearing a wild tenorman's bawling horns across the way going, ee-yah(ph), ee-ya, and hands clapping to the beat and folks yelling go, go, go.
"EE's decision to offer both a relatively lower-priced tariff at the entry level and a plan with more data at the top end is clearly in response to customer feedback, " said Matthew Howett, an analyst with research firm Ovum.
Mail: U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy (EE-1), 1000 Independence Avenue, SW , Washington, DC 20585.
Even if stuck in rush hour traffic, passengers will experience a super-speedy journey thanks to free mobile 4G from EE, as Britain's only superfast 4G network brings the latest in communications technology to this unique fleet of taxis.
ENGADGET: EE launches free 4G WiFi service in (some) London black cabs
The other question - will EE be able to offer UK customers a 4G iPhone after tomorrow's Apple launch?
When EE's network launched, rivals questioned whether the spectrum band that it was using - 1800MHz - would provide good indoor coverage.
The HTC One will be available on EE's superfast 4G service via the EE online shop, EE telesales and EE retail stores from mid-March.
ENGADGET: HTC One coming to Sprint, T-Mobile, AT&T in the US, arriving in UK on EE, Vodafone and O2
Confusingly, anyone looking to grab the UK's first LTE network on the iPhone 5 will have to sign up to a "4GEE from EE" plan -- which still hasn't revealed its pricing.
The iPhone 5 is the first of Apple's handsets to support 4G, but it has been optimised for just three spectrum bands - the 1800MHz band, which EE has been allowed to use for 4G services, the 850MHz, which doesn't work in the UK, and the 2.1GHz band, which currently only supports 3G services.
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