To get internet access on your mobile phone when away from your fixed mobile modem you need to ensure your mobile data setting is activated.
It depends which phone you have but generally the setting is found under network settings.
It would help if you could tell us what phone you have and exactly what problem you are having when moving away from your fixed modem.
If you require further assistance please email: email@example.com
or contact Afrihost support on 011 612-7200
or via live chat support on our website
alternatively you may request a call back by smsing the word 'help' to 32541