Roaming charges - Other less expensive options to communicat

[seebots]

Would the member share with me what means do you use other than roaming, to stay in touch with your home office whilst travelling outside the borders of SA.
I will be travelling to southern Moz soon and would like to be in contact with my home office in the event of important matters that may arise. I may use I-pad or cellphone.
I have also noted in the past, that cellphone calls made when motoring through Pongola and vicinity, is charged at roaming rates via Zwaziland.
Many thanks in advance.
Johan