In a bid to strengthen its mobile business, Google announced on Monday that it would acquire Motorola Mobility Holdings, the cellphone business that was split from Motorola, for $40 a share in cash, or $12.5 billion.

The offer — by far Google’s largest ever for an acquisition — is 63 percent above the closing price of Motorola Mobility shares on Friday. Motorola manufactures phones that run on Google’s Android software.Android has become an increasingly important platform for Google, as global smartphone adoption accelerates. The platform, launched in 2007, is now used in more than 150 million devices, with 39 manufacturers.

The acquisition would turn Google, which makes the Android mobile operating system, into a full-fledged cellphone manufacturer, in direct competition with Apple.

Wowzers! AT&T and Deutsche Telekom have entered into a definitive agreement for the sale of T-Mobile USA for $39 billion in cash and stocks. The combined customer base of this upcoming behemoth will be 130 million humans, though the agreed deal will have to pass the usual regulatory and closing hurdles before becoming complete. The two companies estimate it'll take them 12 months to get through all the bureaucracy -- if they get through, the proposed network merger will create a de facto GSM monopoly within the United States -- but we don't have to wait that long to start discussing life with only three major US carriers. AT&T envisions it as a rosy garden of "straightforward synergies" thanks to a set of "complementary network technologies, spectrum positions and operations."