Hi FDisk,
You need the Phone library, which gives acces to your device's browser.
If your URL and search text are in variables or views (e.g. Url and Search) you can call :
StartActivity (PhoneIntents.OpenBrowser(Url.Text & Search.Text))
and your browser will be opened with the requested page.
You can have at look at hxxp://www.b4x.com/android/help/phone.html#phoneintents_openbrowser]Basic4android - Phone