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hello all, firstly, im sory if my english bad.
maybe someone know how to fix this.
when i use SonyEricsson T700 i can find 3G signal, but when i use xperia neo, there is no 3G signal.
just only got 2G signal..
help 
Solved! Go to Solution.
Hi, have a look at the Network Mode.
Goto Settings>Wireless & networks>Mobile networks>Network Mode, select WCDMA/GSM.
first you need to know if your phone its compatible with your network since there are 2 versions of it
second go to
settings -> sony ericsson -> internet settings -> ok
don't forget to mark the Correct & Helpful Answers
| 3G Network | HSDPA 900 / 2100 MT15i |
| HSDPA 850 / 1900 / 2100 MT15a |
turn off your phone -> remove the battery and it should tell you which version is it
i've try it, but there is nothing happened.
i've try this too, and nothing happened.
just got Edge signal 
i've seen it now,,my Xperia Neo is MT15i,
hmm,, so what must i do to get 3G/HSDPA signal??
you can google the APN settings type something like
APN settings android "name of your network"
settings -> wireless & networks -> mobile networks -> access point names -> MENU -> add New
enter settings
MENU -> Save
Don't forget to mark the Correct & Helpful Answers
heii,,its work. after i change it, n wait for few second, it change n i've got HSDPA
thx u so much
problem was answered. thx for your help
im very appreciate it