A mobile electronic device comprising at least one part made of a polymer composition [composition (C), herein after] comprising more than 80 % by weight (% wt.) relative to the total weight of the composition (C) of an aromatic polysulfone polymer comprising a residual chlorine content in an amount of less than 25 μeq/g polymer [polymer (PSU Cl ), herein after], wherein more than 50 % by moles of the recurring units of said polymer (PSU Cl ) are recurring units (R PSU_Cl ) of formula (A), herein below : O-Ar-(CXY)-Ar'-O-Ar 1 -SO 2 -[Ar 2 -(T-Ar 3 ) n -SO 2 ] m -Ar 4 - formula (A) wherein - n and m, equal to or different from each other, are independently zero or an integer of 1 to 5 ; - each of Ar, Ar', Ar 1 , Ar 2 , Ar 3 and Ar 4 equal to or different from each other and at each occurrence, is an aromatic moiety, - X and Y, equal to or different from each other and at each occurrence, are independently selected from the group consisting of hydrogen, halogen, alkyl, arylalkyl, hydroxyalkyl, hydroxyarylalkyl, halogenated alkyl, halogenated arylalkyl, alkenyl, alkynyl, alkyloxy, arylalkyloxy, aminoalkyl, aminoarylalkyl, alkyl and arylalkyl substituted by carboxylic acid, ester, amide, aldehyde and ketone function, and - T is a bond or a divalent group optionally comprising one or more than one heteroatom ; preferably T is selected from the group consisting of a bond, -CH 2 -, -C(O)-, -C(CH 3 ) 2 -, -C(CF 3 ) 2 -, -C(=CCl 2 )-, -C(CH 3 )(CH 2 CH 2 COOH)-, and a group of formula : wherein said polymer (PSU Cl ) comprises at least two chain ends and wherein at least one chain end comprises a unit [(unit R end ), herein after] of formula (B), herein below : R 1 -O-Ar-(CXY)-Ar'- formula (B) wherein Ar, Ar', X and Y are as defined above and R 1 is a hydrocarbon, optionally halogenated, having 1-30 carbon atoms selected from the group consisting of saturated or unsaturated, branched or unbranched, aliphatic, aromatic, cyclic, or polycyclic hydrocarbons ; a linear or branched alkoxy group having 1-30 carbon atoms, an aryloxy group or an arylalkoxy group. - n and m, equal to or different from each other, are independently zero or an integer of 1 to 5 ; - each of Ar, Ar', Ar 1 , Ar 2 , Ar 3 and Ar 4 equal to or different from each other and at each occurrence, is an aromatic moiety, - X and Y, equal to or different from each other and at each occurrence, are independently selected from the group consisting of hydrogen, halogen, alkyl, arylalkyl, hydroxyalkyl, hydroxyarylalkyl, halogenated alkyl, halogenated arylalkyl, alkenyl, alkynyl, alkyloxy, arylalkyloxy, aminoalkyl, aminoarylalkyl, alkyl and arylalkyl substituted by carboxylic acid, ester, amide, aldehyde and ketone function, and - T is a bond or a divalent group optionally comprising one or more than one heteroatom ; preferably T is selected from the group consisting of a bond, -CH 2 -, -C(O)-, -C(CH 3 ) 2 -, -C(CF 3 ) 2 -, -C(=CCl 2 )-, -C(CH 3 )(CH 2 CH 2 COOH)-, and a group of formula : wherein said polymer (PSU Cl ) comprises at least two chain ends and wherein at least one chain end comprises a unit [(unit R end ), herein after] of formula (B), herein below : R 1 -O-Ar-(CXY)-Ar'- formula (B) <EOS>