...than returned the iPhone 3GS...

[Tofu]

Hello Alan, Mister Micawber, Beeesneees, Mordant, Esl_Expert and other native English speakers,

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http://tinyurl.com/2cmlpyf
Jobs said that just 0.5 per cent of all iPhone 4 users – around 15,000 people – had contacted Apple to complain about antenna problems. He also said that fewer people had returned iPhone 4 handsets than returned the iPhone 3GS, the handset Apple launched in 2009.
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"...fewer people had returned iPhone 4 handsets than returned the iPhone 3GS..."
Is this fine as it is? Is there anything missing between than and returned?

[Beeesneees]

The missing 'had' is assumed and this is acceptable usage.
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Cheers m' dears!

[Tofu]

Thank you, B.