Low end Rs 1000 range mobiles have limited SMS storage

For many mobile phone users like the domain investor, who do not access the internet using their phone, a basic mobile costing approximately Rs 1000 is usually adequate since they are only receiving smses, making and receiving phone calls
However one of the major problems which is observed for almost all the lowend mobiles is that they have limited sms storage capacity while the mobile with internet connection can store far more smses. deleting smses is very time consuming.
The storage capacity cannot be increased by adding a memory card.
The domain investor has used 4 different mobile brands Karbonn, Micromax, Intex, Nokia , she is facing the same problem of sms storage capacity not being sufficient.
The specifications of the manufacturer are also not accurate.
This has forced the domain investor to purchase a smartphone.
If there is any quality low end mobile phone with a large sms storage capacity