it all depends on the amp rating of your charger for your phone if its over 1 amp i wouldnt use it to charge it tobe on the safe side it should also say somewere in the instructions what amp rating is safe. i know some mods can be charged using a 1 amp charger even some can be done with a 2 amp charger but there things like the dna 200 from evolve. if you can have a look at the amp rating and if it is 1 amp then dont use it and as for using a phone cable i use one from time to time but its only 0.5amp so it will take longer to charge buit i can wait and from what i`ve seen of the coolfire you can use it while charge with no probs it has biult in safety features so it shouldnt do anything and £45 is a good price most places are selling them for that price without the tank as for juice try this place ive used them abit and there juices are pretty nice the creme dream is rather nice i went through two 30ml bottles in a week and use code FREE for money off http://e-juicestore.co.uk/shop/ oh and second mod is always a good idea i have three mods on the go at one time with different juice in each tank so i can get a good mixture of flavour