20 Most Recent Doro 730R Cordless Phone - Page 6 Questions & Answers

That may be so but the sim is the issue not the phone, did the sim come with the phone. If it did does it require activation with the service provider in order to activate it's services. If it is an old sim, i.e. one that has not been used for a considerable time, it is possible that the number is now obsolete or has been reassigned. It might be that the sim is incompatible with the phone, is the handset compatible with the sim, i.e. if it is locked are they for the same network. Also, the sim might be damaged, attempt to use it in another, unlocked, phone in order to test whether this is so

This is a integrated circuit issue. It is not worth the expense and it is now off warranty. You'll have to buy a new one or just live with it.

try shutting down phone. then hold the down volume key while restarting. releasing after title page appears. then press menu and up volume. proceed from there. or click suche basis then proceed.

It would make more sense to contact Doro (in your country) rather than posting a general question here. Support Information and contact details Doro Easy to use mobile phones and...

If it is the Phones new number you need, you simply call to a cellular (mobile phone) to get it :-)

You may download a copy of the manual at http://www.doro.com.au/ProductManuals/Manuals/Web_Manual_PhoneEasy_623_en_v10(r11824).pdf