To determine if your phone will work in the US, you need to check if it is compatible with US cellular networks. Most modern phones are compatible with US networks, but it's best to check with your phone's manufacturer or your carrier to confirm. Additionally, make sure your phone is unlocked and supports the necessary frequencies used in the US.
NO!
roaming
no. different frequency but I wish
No - usually the mobile networks will do all the 'hard work' for you.
Yes it will as long as it is GSM and it is unlocked
Yes, everything will work, except you'll have to switch your phone (at the place you got it) from US lines to Singapore lines.
Yes. Most Canadian mobile phone companies have a partner in the US. For example, my Rogers phone connects to AT&T in the US. I receive a text message welcoming me to the US, however you will still get roaming and long distance charges.
it depends on the phone you want to buy. your phone must be capatible with US Cellulars technology. This information can generally be found on the carriers website. US Cellular uses CDMA, so your phone needs to support CDMA. A GSM phone will not work on US Cellulars network.
Yes it is just like a phone. :)
Probably, it depends on where your phone is actually from because the frequencies may not be the same. However, Sprint is a major US cellular carrier and it is likely that your phone will work fine.
It depends on whether it is the US version or the European version. I was sold one in the UK with a 'promise' that it would work in the US - but it doesn't, now I have a useless phoen in the US and need to go buy another phone. So, you need to check which version it is, and, I believe that the US version WILL NOT work in Europe. Hope this is of some help.
No, range of the phone is GSM 900/ 1800. GSM range in the US is 850/ 1900.