If you are calling a Landline from outside India dial India code 91 and then city code 821. Example to call 2612222 from outside India you have to dial +91-821-2612222
If you want to call a cell number from outisde India just add 91. Example - If you want to call 9343260001 you need to dial 91-9343260001

To dial a landline from outside Mysore or from your cell phone you need to dial 0821-followed by the number. Example 0821-2612222

To dial a cellphone number which doesn't belong to the same state as your Mobile you must add 0 before the number.