No Sir, Its not at all possible as the phone's band is not at all compatible with the 4G Network, But you do get cheaper 4G Handset in market. Go for an exchange. Thanks
Since the phone was not in physically contact with water, Then there is obviously no chance of any water damage, According to the symptoms its a definite issue with your battery. Replace your battery and the handset should be just fine. Thanks
Greetings for the day, Good that you upgraded your Mac Mini to Core 2 Duo Processor, And now that you updated the hardware you can install the OS to 10.7.5 LION You shouldn't have any problem doing it so, Just make sure you keep the Ram 2 GB or More
Try Replacing your GPU, Clean the contacts of the card, Change the slots, this would be the first step towards the repair, And if still doesn't work try re installing your OS Message me back if you still face any problem
It generally happens iMac gets stuck at the Spinning wheel, So to easily diagnose it try to reinstall the operating system first and if it still doesnt work theres definately a issue with the GPU
If you get a Blue, or Grey Screen after the Spinning Logo, there may be some problem with your Graphics Card, or if it just keeps Spinning, try formatting your iMac.