Where can I get a copy of user manual for HTC Salsa C510b

And your problem is...?

it should give you a time limited and try it agin

How to unlock the htc salsa c510b pattren lock - I had forgot my gmail email id and password

Hi. You HTC SALSA mobile phone must be network restricted. That is why it is not recognizing any other SIM card. It needs to be unlocked from network restriction. You can unlock a HTC SALSA safer and easier using unlock code. You can get the unlock code for a HTC SALSA from www.SuperUnlockCodes.com at affordable cost with easy unlocking guide. Good luck mate.

Simply go to the HTC website and select the support page from the top bar. Select your device, then when the page loads for the device, select User Guides.
In case you have trouble, I've provided a link directly to the user guides page. Click on user manual to download it as a PDF file. Make sure you save it!

http://www.htc.com/www/support/userguides.aspx?p_id=449&p_name=htc-desire-c

May be your phone is locked to other carrier?

Your cell phone may be locked to a particular cell phoneprovider and in this case it needs to be unlocked to use with a different cellphone service provider.To get the security code/restriction code to unlock the cellphone from the current cell phone provider so you can use the SIM card with adifferent phone provider, Please click on this link and follow my instructions:-http://www.fixya.com/support/r4049238-unlock_cell_phoneIf yourphone provider does not help you then these WEB sites it provides securitycodes for a small price.http://www.mobileunlockstore.com/?gclid=CKDb2_y2558CFSlJagodxBkDHwhttp://www.mobileunlocksolutions.com/

i forget my phone password

Yes it is possible , but not using your regular phone network . You need to use a third party software ( skype , google chat etc ) and you will be able to chat using that .

Hi,

for video call download oovoo mobile app from here or skype mobile from here .If you need any further assistance click here .

Hope this helps, thanks!