I have a standard Galaxy s2 which is only a couple of weeks old. In the UK on O2. Now according to O2, i can video call as part of my minutes a month so id like to use it! Its 50p per minute on payg otherwise Anyway, the first time i tried to video call, it said something about 3g. As im not up on this technology thing, i assumed it meant my signal was no good. I stood at the backdoor and tried it again & it worked, i managed to video call ! Walked back into the house it stayed connected. Thats the only video call ive been able to make. Everytime ive tried since, even immediately afer the first call, keeps saying 'unable to make video call. make voice call instead?' It doesnt mention anything about 3g (which i now know is the mobile inernet and not over wifi?) Even though i was connected via wifi the first time and it worked, ive even disconected from wifi so the mobile internet kicks in and is still the same. Ive called O2 and they dont seem to know, but i wanted to check that i didnt need to sign for it to enable it (although it worked that once!). So now im at a loss. Do i need to be connected to wifi or mobile internet to make a video call? I wouldnt have thought it was a necessity myself but from what i can gather, people are going on that you need an app, and connected to 3g? I dont even know how to connect to 3g, only to turn my wifi off so it connects to mobile internet. I didn use any app as it worked through the video cal button next to a contact details in my phone book in the first place. I dont want to use an app, as no one i know uses them! Oh, and yes, the phones im trying are video call compaable, HTC, IPHONE4, BB BOLD. The Bold person makes video calls all the time so there phone 100% does! Any ideas anyone please?