Cellphones may capitalize the first letter of your user name and/or password. For instance, if your user name needs to be admin the cellphone will automatically change the first letter to a capital A or Admin. This is causing the login problems. Try turning off this feature or double the first character and then edit the word and remove the capital letter. Example: Type aadmin which the cell phone will turn into Aadmin and then go back and remove the capital A to get the admin before submitting the name.