well switching from sprint would or would not help at all. Most CDMA carriers share towers and what you should be doing is finding what towers are in your area and who owns them If none are closer to you then sprints you are out of luck. Since no carrier says they guarantee service inside a building. Or go to sprints, tmobile and att site I think they have street level maps and compare. If they all say great or good and you have a crappy signal its what your house is made of.

Second get a home phone they are not that expensive and if your having that much trouble it may be worth it. if not stop complaining and deal with the reception. Sanyo;s get the best on sprint. Blackberry's are good too but they are not going to increase from hardly...
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Sanyos are generally great for service so don't assume your phone is junk. Ultimately it is not going to matter what phone or what carrier you go with if you live in a basement or garden apartment. The Pearl will be no better or worse for service. Your unit may also be in a coverage hole or fair coverage area, therefore, changing phones would do nothing. In one of the other replies someone mentioned the shared tower fact. Yes, most carriers share towers but they don't broadcast at the same levels. You may or may not get a stronger signal by switching carriers. Ultimately it's not worth spending money by buying new phones just because you don't get service in your unit. I'd rather move than have to buy a new phone to try to solve a pr...
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do you want a BB and all the extras they come with or a will a basic phone suit your needs?

if you can do with a basic phone, try the M300