communication antenna 1402 also has electrical traces 1405 and 1506 arranged according to the shape of the contactless communication antenna 1402 and the position of the electrical contact pads 1404 fig1 and 17 shows top and bottom views of a battery with a contactless communication antenna the batter 102 has a contactless communication antenna 1202 with electrical contact pads of the contactless communication antenna 1202 folded to place the bulk of the contactless communication antenna and its contact pads on opposing sides of the battery 102 fig1 shows example dimensions of the set of electrical contact pads on embodiments of the mobile phone smart card complying with iso 7816 the distance between side walls of the chip card 20 or 100 from a left edge 112 and an upper edge 114 are also shown a typical sim card slot is capable of holding a typical sim card which has second size dimensions with a plug in size of about 25 mm long and 15 mm wide and less than 1 mm thick a plug in sim card size is for example less than 1 mm thick example u201c mini sized u201d sim cards have size dimensions of 15 mm long 12 mm wide and less than 1 mm thick the sim card includes at least a subset of contact pads compliant with iso 7816 2 which includes contact pads 1 8 c1 c8 defined according to iso 7816 as follows the contact pads c1 c2 c3 c5 c6 c7 have been assigned as interface pins for use with the functions as described in table 1 two of the contact pads c4 and c8 are.