how can i unlock my samsung u700 to any network for free?

You get the unlocking service from Unlocking4U - Unlocking the Samsung U700 mobile phone .This site provides the unlocking code and instructions at cheap price.Through this you can unlock your mobile easily.

jamesbry00 said:

at the moment my phone will accept an o2 sim but gives me no signal strength

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Hi free unlock code is not available for your mobile. So better you can go for paid unlocking service. I would suggest this site Mobileunlocksolutions.com here you can get the code and unlock your mobile at low cost. After unlock your mobile you can easily swap to any other network.