Webwire: Sprint objects to T-Mo sale; Twitter plays musical chairs

Sprint Nextel CEO Dan Hesse has called on US regulators to block AT&T’s planned $39 billion (€27.5 billion) acquisition of T-Mobile USA.
Jack Dorsey, one of Twitter's founders, will replace fellow founder Evan Williams as head of product development.
Japanese chip testing equipment maker Advantest will acquire Singapore-headquartered rival Verigy for 90.9 billion yen (€787 million) to grow its smartphone testing portfolio.
New Zealand's Department of Internal Affairs survived a distributed denial of service (DDoS) attack by online activist group Anonymous, which was protesting about an internet filter supplied to ISPs.
Shares in Philippines carrier Digitel soared on Monday on the back of rumors its parent may sell the venture to PLDT.
Uganda's opposition party is calling for a boycott of incumbent operator MTN Uganda for jamming phone lines at an opposition poll tally center during a February 18 election. MTN denies the claim, stating it has not received a formal complaint.