
Are the following mentions coreferent?:
<m> announced </m> in T-Mobile has announced it will be carrying the BlackBerry Curve 8900 smartphone this February. U.S. mobile operator T-Mobile has officially announced it will be offering the BlackBerry Curve 8900 smartphone this February. T-Mobile has not revealed an official release date or pricing information for the BlackBerry Curve 8900, although the unit will work with T-Mobile's unlimited HotSpot Wi-Fi based calling service. 
</s>
<m> announced </m> in T - Mobile has announced that the BlackBerry Q10 is coming to their network. 