Mobile phone retailers in the United Kingdom have begun removing the Google Nexus 4 from their inventories, sparking speculation that a successor could be on its way. Both Carphone Warehouse and Phones4U have ceased selling the handset this week, just days before Google I/O 2013 gets underway.

EE has announced plans to double its 4G LTE network speeds in ten U.K. cities by the summer. The move will boost headline speeds to 80Mbps, and increase the average speed to 20Mbps for both new and existing subscribers. The carrier says this is part of its ambition to “stay one step ahead” as rival carriers prepare to launch their own 4G networks in the coming months.

British carrier O2 has today launched a new VoIP and messaging service called TU Go, which is available to its pay monthly customers with Android and iOS devices. The service allows users to make calls and send texts over the Internet, so even when they have no cell reception, they can connect to a Wi-Fi hotspot and get in touch with friends and family.

British carrier O2 has released a new app for Android and iOS called O2 Tracks, which allows users to listen to the U.K.’s official top 40 singles to their smartphone. It’s available to download now from the App Store and Google Play, and O2 customers can enjoy the service for just £1 ($1.56) per week.

O2 has begun rolling out the Sony Xperia T’s Android 4.1.2 Jelly Bean upgrade, just a day after it was announced by Sony. The update brings a number of changes and improvements, including a bunch of new apps and some enhancements for the launcher.