For address field:-
1. check the pin code is existed or not after entering the
country name.

For mobile number field :-
1. check weather country code and mobile number is properly
given or not

For landline Number field:- 
1. check proper country code and area code are given or not.

Hi ALl,

a.Address Field:-1. it should not be a text box, infact it
should be a grid as it will accept more characters.
 2. IT should accept characters, numbers and few special
characters like #,@,/,(,) and - only                      
 # --->to be used for giving flat no. like #101,
 @ --->if they are giving mail address,
 / --->and - if they go for door no., 
(,) --->for writing alias name like sameer (abdul).

  3. Pin code should not be in grid box if it is there we
cannot validate it, so it is always advisable to have pin
code as next text box to validate because in for no. 2 we
have given validation to special characters which is always
advisable and we cannot validate here in pin code which will
be a mismatch. so always advisable to be as seperate text
box , you can view to more no. of application where pin box
will be seperate.

b Mobile and landline number field?
 for these both we should have seperate individual text boxes.


 Mobile Number:-1. it should strictly accept only
numericals.and numbers should not be less than 8 digits
because the universal code digits for mobile starts from 8
mandatory.
 2. all the digits should not be zeros.
 
 landline:-  it should be of two text boxes one for code and
other for no.
and it should strictly accept numericals only. the country
no ( should be valid country no.) and landline no. should be
correct.


for these following points we have to create test cases. 
I hope this might help you.