Some of Bootstrap3 glyphicons are not displayed correctly on phonegap android webview

It's a problem with the escape sequences. If you can reliably maintain a UTF-8 encoded CSS file, you could override the Bootstrap defaults to use the actual, non-escaped glyphs.

(Depending on your browser, the following code will appear to contain a bunch of boxes. Copying the code and pasting it into a UTF-8 document should preserve the values, though.)

@charset "UTF-8";.glyphicon-bell:before {  content: "🔔";}.glyphicon-bookmark:before {  content: "🔖";}.glyphicon-briefcase:before {  content: "💼";}.glyphicon-calendar:before {  content: "📅";}.glyphicon-camera:before {  content: "📷";}.glyphicon-fire:before {  content: "🔥";}.glyphicon-lock:before {  content: "🔒";}.glyphicon-paperclip:before {  content: "📎";}.glyphicon-pushpin:before {  content: "📌";}.glyphicon-wrench:before {  content: "🔧";}

You can also change the escape sequences to workaround this problem, but browser support varies. If you're only targeting Android/BlackBerry, the following should work fine:

.glyphicon-bell:before {  content: "\d83d\dd14";}.glyphicon-bookmark:before {  content: "\d83d\dd16";}.glyphicon-briefcase:before {  content: "\d83d\dcbc";}.glyphicon-calendar:before {  content: "\d83d\dcc5";}.glyphicon-camera:before {  content: "\d83d\dcf7";}.glyphicon-fire:before {  content: "\d83d\dd25";}.glyphicon-lock:before {  content: "\d83d\dd12";}.glyphicon-paperclip:before {  content: "\d83d\dcce";}.glyphicon-pushpin:before {  content: "\d83d\dccc";}.glyphicon-wrench:before {  content: "\d83d\dd27";}

It could be because of mismatch between version of bootstrap min .css file and glyph files.