At the same time, no-charge numbers were allocated to special prefixes or to the Bucharest area code, looking like "01800-xxxx" . Under a special agreement, even before this reform, foreign operators could be reached at various numbers, usually in the prefix "800" (AT&T used "01800-1800"). The extra-charge numbers were allotted the prefix "0189", being called like "0189-xxx-xxx". This has been extended to all area codes, as "0pp-89x-xxx", and callers could dial them without the area codes, like the regular local calls. This made them too accessible to children and sometimes telephone lines were hijacked to make calls to these services, then to be charged to the line subscribers who never made these calls by themselves. It was very customary to the aggressive advertising to write the costs of the services with small fonts, likely unreadable on the TV screen, then announcing the first 20 seconds free, writing the "free" word in bigger size, to induce the idea of the calls being all free.