Dear Hashim, it is always advised not to upload images for entrance examinations from a mobile phone no matter how reputed the company might be. The information brochure clearly mentions the same. This is because the servers used for the application forms do not accept the format. It is always in your best interest that it is suggested to go to an internet cafe and get your signature and photograph scanned and then upload it to your application form. You do not want to risk rejection of an application form over a Signature or a Photograph.