Several mobile operators don't think Nokia's Windows Phone-based Lumia smartphone is good enough to compete with Apple's iPhone and Android smartphones, Reuters reports, citing sources in four major telecoms.

These sources blame high price (for a product that they say is not innovative), poor marketing and recent software glitches for the lack of customer interest in the Lumias.

"No one comes into the store and asks for a Windows phone," said one executive in charge of mobile devices at a European operator.

In our review of the Lumia 900, we've found the device to be the best Windows Phone we've encountered. With strong competition from Android and iOS, both of which offer more apps to consumers, one has to wonder whether that's enough — and some mobile operators don't think so.

"If the Lumia with the same hardware came with Android in it and not Windows, it would be much easier to sell," said one of Reuters' sources.

Nokia put all its chips into the deal with Microsoft, so there isn't much it can do about this except try its hardest to build the best possible devices and aggressively promote them. The question is: Could mobile operators themselves do more to promote the Lumias?

What do you think? Are Nokia's Lumia devices really inferior to Android phones and the iPhone? Sound off in the comments.

BONUS: Nokia Lumia 900 in Photos