The Nokia X supports quad-band GSM/EDGE on both SIM cards and dual-band 3G networks on its primary SIM card. HSPA is supported too, you get HSDPA speeds up to 7.2Mbps and HSUPA up to 5.76Mbps.
Then there's Wi-Fi b/g/n, which will get you fast data speeds and it doesn't eat into your data plan. Bluetooth 3.0 with EDR handles things like wireless hands-free dongles but also local file sharing.
The Nokia X uses a microUSB port for both data connections and charging. There is no USB on-the-go support, though.
The X also has a memory card slot that supports cards up to 32GB capacity. Coupled with a card reader it can usually give you the fastest data transfer rates.
And finally, there's the standard 3.5mm audio jack.
The Nokia X has Wi-Fi and 3G connectivity. The Nokia Browser pre-installed on the Nokia X, quite expectedly, is based on Chromium. It is fast and fluid, loads web pages really fast and provides great experience for such a low-end device.
There's tabbed browsing and you can save favorite websites for quick access.
There is only one setting in the advanced menu - turn on/off saving passwords.
The organizer on the Nokia X is decently stocked though it lacks any kind of document viewer. As for the file manager, Astro File Manager is available for free in the Nokia Store and works great.
The Calendar starts off in month view. Day and week view are also available. Adding an event is very easy - you can set start and end time, reminder, location and repeat interval.
The alarm app uses two rotation rings, making it easy to set the time and you can make it go off only on specific days. Multiple alarms are available as well.
A calculator is also on board.
There are also pre-installed Facebook and Twitter clients.