I've lost count of the number of versions of Minesweeper for Symbian now, but I'm not going to let another decent incarnation slip by without comment because this one's both well programmed and totally free, without even any in-game ads to endure. Screenshots and link below, but this is definitely one to install to while away bored moments waiting in line....

Here's Mines in action:

Pleasant, if slightly minimalist, artwork - tap on the mine bottom left to change the difficulty level (the icon changes to reflect this), from Easy to Medium to Hard; (right) basic help, and a pointer to the commercial (themed) version

You know the layout, you know the game - tap to check a square, long tap to 'flag' up where you think a mine is - get it wrong and 'boom'! 

A game well in progress and... completed! On the right screen, you can just see the congratulatory message fading out. This was in 'Easy' mode, mind you!

Note that the playing field ('minefield') is much larger than the screen - you pan around by swiping with your finger. On the 'Hard' level, the playing area is massive, you'll be doing well to not make any mistakes in a minefield that size.

The added catch here is that there's a clock running (top left), meaning that you'll be tempted to hurry, trying to beat your best score - and, when hurrying, you'll make a logical error, bringing us back to... Boom! High scores (best times) are recorded and can be checked from the main menu.

You can download Mines for free here - all the developer asks is that you consider buying his Trap Finder variant as well, which adds themes to the basic gameplay.