Try going to settings then navigate to data usage, scroll down to the apps not connecting. Open such apps, scroll down and check if background data is restricted. Uncheck the box if ticked. Since your browser is working then other apps should work except you have an app like a firewall or antivirus blocking some apps from accessing the internet.

BRAND NEW 10.2 INCH 512MB RAM + 8GB + GPS + HDMI + CAMERA + WIFI + 3G (MODEM) +
DIRECT USB PORT, SLIM ANDROID 2.2 TABLET PC WITH REAL ORIGINAL ANDROID MARKET.

ARM11 INFORTM 1GHZ PROCESSOR
COME WITH LATEST AND STABLE FIRMWARE 25 JULY 2011.
SUPPORT GPS
1024*600 SCREEN RESOLUTION
SUPPORT FLASH 10.1
SUPPORT REAL GOOGLE ANDROID MARKET
MOUSE AND KEYPBOARD COMPATIBLE.
ROOTED ANDROID VERSION
CAMERA 2.0MPIXEL
SENSITIVE RESISTIVE TOUCH SCREEN WITH 2 FINGER MULTI TOUCH PINCH ZOOM
DIRECT USB PORT, WITH 2 PORTS , 3MM HEAD PHONE JACK,
SUPPORT 3G BROADBAND MODEM E.G HUAWEI
SUPPORT VIDEO AND AUDIO FORMATS: MP3, WMA,MP2, MP4, OGG, AAC, M4A, MA4, FLAC, APE, 3GP, WAV, 3GPP, AVI, RM, RMVB, MKV, WMV, MOV, PMP, MPEG, MPG, FLV, H.264 AND MANY MORE.
GRADE A QUALITY BATTERY 3800MAH X 2 = 7200MAH
SUPPORT WIFI / WIRELESS A/B/G/N, BLUETOOTH, VPN NETWORKS, ASDL, 10/100M ETHERNET LAN
G-SENSOR - GRAVITY 4-DIMENSIONAL AUTO ROTATE WITH ACCELOREMETER
HD MEDIA PLAYING AND MULTI-TASKING
ROOTED ANDROID VERSION WHICH GIVES YOU ABILITY TO MANIPULATE THE DEVICE TO YOUR OWN TASTE AS WELL AS UPGRADING TO THE LATEST FIRMWARE.
MICROSOFT WORD, EXCEL, POWERPOINT, ADOBE PDF, GOOGLE SYNC, CALENDAR, ZIP AND RAR FILE SUPPORT, HTML EDITOR, NOTEPAD, ALL FILE FORMATS SUPPORT.
GMAIL, SKYPE, WINDOWS MESSENGER, WHATSAPP MESSENGER, YAHOO MESSENGER, YAHOO MAIL, UCWEB, FIREFOX, EBUDDY e.t.c.
GOOGLE CHROME BROWSER, OPERAMINI, EMAIL, DOLPHIN HD BROWSER, YOUTUBE, TTPOD MUSIC PLAYER, E-READER.
MEMORY CARD PORT UP TO 64GB, HDMI PORT FOR TV CONNECTION.
TOUCH SCREEN PEN.
CALCULATOR, VOICE RECORDER, APK MANAGER, TASK MANAGER.
GOOGLE MAPS WITH GPS, NAVIGATION AND 3D STREET VIEW.
CIFS MANAGER, SSH DAEMON, TERMINAL (COMMAND PROMPT), GSCRIPT FOR EXTRA FEATURES, TITANIUM BACKUP, INSTALLER, AUTORUN KILLER.
HIGH END GAMES: SPIDERMAN HD, NEED FOR SPEEED, ANGRY BIRDS, ASSASSINS CREED e.t.c.
PIANO, QUICK OFFICE, DOCUMENTS TO GO, BIBLE, QURAN.
UNLIMITED HOME SCREEN, WIDGETS, REAL PLAYER, WIRELESS TETHER, APN MANAGER.
SUPPORT FOR FLASH, EXTERNAL HARD DISK.