Microsoft has discontinued the Kin phones line, just six weeks after it launched the devices. The company blamed low sales numbers, and was shy to say how many it sold exactly. But Kin’s failure comes as no surprise, with a troubled Microsoft playing catch-up in the mobile world.

Two Maryland residents have filed a class action lawsuit against Apple and AT&T over the iPhone 4 antenna design issue that has caused dropped calls and signal loss for some users. The plaintiffs are seeking financial compensation for their troubles, and the case also asks the court to prevent Apple from selling the iPhone 4 until the antenna issue is solved. The laundry list of allegations against the two companies includes negligence, breach of implied warranty, deceptive trade practices and fraud. The suit also holds Apple accountable for knowingly selling a defective product, according to Computerworld.

PhatWare has released WritePad 4 for iPad. The handwriting recognition app now includes a better input method and support for an external keyboard and mouse.

U.K. mobile provider O2 is warning prospective customers that they won’t be able to acquire an iPhone 4 device until at least the end of July.

Verizon, Motorola, and Adobe have announced they will be introducing the next generation of Droid mobile devices on Wednesday, June 23. The Droid launch comes just one day before Apple officially launches iPhone 4 , the next-generation of Cupertino’s super-popular smartphone. Adobe will be on hand at the Droid launch on June 23 presumably to tout the virtues of the much ballyhooed Flash Player 10.1 for mobile devices that is compatible with Android 2.2, Palm WebOS, and Symbian S60 systems.