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Developers with access to Nokia’s Remote Device Access (RDA) tool have “discovered” a bunch of new Lumia and Belle phones. Interestingly, four of these handsets seem to be Windows Phone devices while the Belle 805 should be running on Symbian Belle.

According to Nokia Power User, the Lumia 920, 950, 1001 and Nokia 510 could be authentic or just misinformation planted by rumormongers. However, the blog believes that the Nokia 510 and Belle 805 are likely “authentic” and that the Nokia 510 could be the “cheapest Windows Phone 7.5 device” aimed at competing against Android.

We think the blog could be right because it doesn’t make any sense for Nokia to release any new high-end Windows Phone 7.5 handsets at the moment with Windows Phone 8 (WP8) expected to launch soon. However, a budget device like the Nokia 510 running the Tango update could be just the thing to maintain Nokia’s presence in the smartphone market before the WP8 mobiles arrive.