Hey hello well i can only tell you this your phone is either
1) Bad ( DId you get it in a legit phone store ) ?
2) Your card may be bad and it won't work
If you didn't get it in a store that sells original phones might be one of these if not then i can't help you
Alright so i think your phone may be running old since you got it 3 years ago and it might be over used or either check the Card go too someone who is good with phones he/she may be able too help Or goo too the store which you bought it from they may be able too tell you more
Also tell me if you updated your phone in the 3 years ?
So i may be not right about you Card being bad or the Overusing if i am not then as i said visit the store which you bough it from or simply get a new phone if you cannot find the real problem off this
The only way you can is if it runs and it can't you have too acess the settings and find delete Card and stuff try contacting someone who's good with technology and ask him too help you i guess he can figure the problem out