1. he went into the house and asking where is ur phone line..
2. he uses his own modem + laptop if he is bringing one to test dsl readings
3. usually he will contact u 1st.. but if he fails to, u can contact helpline to get the assigned tech hp number so that u could arrange the appointment with him..

if the readings passed, he will activate it and do some calls with the activation department maybe.. not sure.. then he say to me it will be activated usually within 24hours.. mine activated already according to tm customer service as they told mine was already updated, but my port are still capped at 1024.. maybe the assigned tech was lazy T_T.. or maybe there is some missunderstanding or mistake done somewhere..

Well there you go, your line's quality is not suitable for 4 Mbps. If you want to improve you line's quality, refer here since he/she has experience about it. Sometimes the telephone socket's quality has degraded (like mine) and I get bad line quality. More extreme measure would be to change the wire between your house and the pole outside your house (cost money).